What is the difference between mold and mildew?

Mold is a fuzzy, often black or green fungus that penetrates surfaces, while mildew is a flat, powdery, white or gray fungus that grows on the surface of damp materials.

Is mildew a type of mold?

Yes, mildew is a specific type of mold, but the term usually refers to the common, flat, powdery growth found on plants or bathroom surfaces, whereas mold describes the broader category.

Which is more dangerous to your health, mold or mildew?

Mold is more dangerous because it produces allergens and mycotoxins that can cause serious respiratory issues, while mildew typically causes only mild allergy symptoms like sneezing or a runny nose.

Does bleach effectively kill both mold and mildew?

Bleach kills surface mildew effectively, but it cannot penetrate porous materials to kill mold roots, so it fails to stop mold from regrowing underneath the surface.

What is the typical cost to remove mold versus mildew?

Professional mold removal costs between $500 and $6,000 because it requires containment and remediation, while mildew removal is a simple DIY task costing under $30 for cleaning supplies.

Can you paint over mildew or mold to hide it?

No, painting over mold or mildew traps moisture and allows the growth to spread, so you must clean and treat the affected area with a fungicide before priming and painting.

Is it safe to clean mildew with vinegar instead of commercial products?

Yes, white vinegar is safe and effective because its mild acidity kills up to 82% of mold species, including common mildew, without exposing you to harsh bleach fumes.

What is the most common beginner mistake when treating mold and mildew?

The most common mistake is scrubbing the growth without wearing protective gear, which releases spores into the air and increases your risk of inhaling allergens.

Can you use the same cleaning method for mold on drywall and mildew on tile?

No, you cannot use the same method because drywall is porous and requires replacement or a specialized fungicide, while tile is non-porous and can be cleaned safely with a simple bleach solution.

Can I switch from using a commercial mildew spray to a natural borax solution?

Yes, you can switch to a borax solution because it kills both mold and mildew naturally, and unlike bleach, it leaves a residue that prevents future growth on the treated surface.

Difference Between

Difference Between Mold and Mildew

Written byNex Virox Team

Editorial Team

Reviewed byVarshal Nirbhavane

Senior SEO & Organic Growth Professional · 5+ years

Published: August 25, 202618 min read

Quick answer

The main difference between Mold and Mildew is that mold penetrates surfaces and appears fuzzy or slimy, while mildew stays flat on surfaces and appears powdery. Mold is a multi-celled fungus that grows deep into materials, while Mildew is a surface-level fungus that grows on damp, flat areas.

Key takeaways

Core distinction: Mold is a fuzzy, dark growth penetrating surfaces, while mildew is a flat, powdery white or gray coating.
How each works: Mold digests organic materials deeply, causing structural rot; mildew grows only on moist surface areas.
Cost and effort: Mildew removal needs simple bleach and scrubbing; mold remediation often demands professionals and costly material replacement.
Best-fit use case: Identify mildew on bathroom grout or fabrics; suspect mold in drywall, wood, or behind walls.
Most common mistake: Treating surface mildew with bleach while hidden mold thrives, allowing toxic growth and property damage to spread.

Table of Contents18 sections

Difference Between Mold and Mildew: Comparison Table

Aspect	Mold	Mildew
Definition	A broad category of fungi that grow in multicellular filaments called hyphae.	A specific type of fungus that grows flat on surfaces or as plant pathogens.
Purpose	Breaks down dead organic matter like wood, paper, and food in nature.	Often colonizes living plants or damp surfaces as a surface-level growth.
Core Mechanism	Spreads via lightweight spores that travel through air and germinate on moisture.	Spreads via spores that require a damp film and reproduce rapidly on flat areas.
Appearance	Appears fuzzy, slimy, or textured with patches of green, black, brown, or orange.	Appears flat, powdery, or downy with white, grey, or light yellow coloring.
Texture	Feels fuzzy, velvety, or slimy depending on the species and surface.	Feels powdery or dusty to the touch on surfaces like leaves or fabrics.
Growth Pattern	Grows in irregular, spreading patches that penetrate deeply into porous materials.	Grows in flat, circular, or web-like patterns that stay on the surface layer.
Common Locations	Found on wood, drywall, insulation, and ceiling tiles in damp indoor areas.	Found on damp fabrics, bathroom tiles, window sills, and plant leaves.
Color Range	Displays a wide range including black, green, red, blue, and purple hues.	Restricted mostly to white, grey, light brown, or pale yellow shades.
Structural Impact	Penetrates and degrades wood, drywall, and structural beams over time.	Remains largely cosmetic and rarely causes structural damage to building materials.
Health Risks	Produces allergens and mycotoxins that may trigger asthma and respiratory irritation.	Causes mild allergic reactions like sneezing, coughing, or skin irritation.
Growth Speed	Can colonize a surface within 24 to 48 hours under ideal moisture conditions.	Appears quickly on damp surfaces, often within 24 hours after water exposure.
Moisture Requirement	Requires persistent moisture, humidity above 60 percent, or a water leak to thrive.	Needs only a thin surface film of moisture or high humidity to germinate.
Surface Penetration	Roots called hyphae penetrate deep into wood, drywall, and other porous materials.	Stays on the top surface without penetrating deeply into the material underneath.
Smell	Emits a strong musty, earthy, or rotting odor that is noticeable indoors.	Has a milder, damp, or musty smell that is less pungent than mold.
Detection	Often requires professional testing or visible inspection of hidden wall cavities.	Easily spotted as a visible powdery or flat patch on a wet surface.
Removal Method	Needs scrubbing with detergent, removal of porous materials, or professional remediation.	Wiped away easily with a diluted bleach solution or commercial cleaner.
Cleaner Type	Requires specialized fungicides, borate solutions, or HEPA vacuuming for complete removal.	Responds to simple vinegar, hydrogen peroxide, or soapy water solutions.
Cost to Treat	Professional remediation often costs thousands of dollars when drywall or wood is removed.	Treating mildew costs little, often under a few dollars for household cleaners.
Speed to Remove	Removal takes days or weeks because porous materials must be replaced and dried.	Cleaning takes minutes to an hour with a simple wipe or spray application.
Accuracy of ID	Requires laboratory testing or a microscope to identify the exact species accurately.	Identifiable visually by its flat, powdery look on a damp surface.
Durability	Survives harsh conditions, returning after cleaning if moisture and spores remain.	Dies quickly once the surface dries out or the humidity drops below 50%.
Scalability	Spreads rapidly across large areas, including behind walls and under floors.	Spreads slowly across a confined flat area like a single wall or leaf.
Prevention	Prevented by fixing leaks, controlling humidity below 50%, and increasing ventilation.	Prevented by wiping surfaces dry, using fans, and ensuring airflow across flat areas.
Safety Gear	Removal requires an N95 mask, gloves, and goggles to avoid inhaling spores.	Cleaning needs minimal protection, though a mask is advised for sensitive people.
Compatibility	Grows on organic materials like wood, paper, cotton, and drywall only.	Grows on both organic surfaces and non-porous materials like glass or tile.
Availability	Present worldwide in indoor and outdoor environments where moisture and food exist.	Common in temperate climates, especially on plants and damp household surfaces.
Common Examples	Includes species like Aspergillus, Penicillium, and Stachybotrys chartarum.	Includes types like powdery mildew and downy mildew that affect plants.
Typical Users	Addressed by homeowners, inspectors, and professional environmental remediation contractors.	Handled by gardeners, homeowners, and maintenance staff with basic cleaning supplies.
Limitations	Cannot be fully eliminated once embedded; requires removal of the contaminated material.	Returns quickly if the underlying dampness or humidity issue is not corrected.
Best-Fit Scenario	Best for describing fuzzy growth on wood, drywall, or insulation after a water leak.	Best for describing powdery growth on bathroom tiles, fabrics, or plant leaves.

What Is Mold?

Mold is a type of fungus that grows indoors and outdoors. It breaks down dead organic matter like wood, paper, and food. Mold reproduces through tiny airborne spores, and it exists to recycle nutrients in nature.

Definition of Mold

Mold is a multicellular fungus that forms visible colonies of branching filaments called hyphae. It digests organic substrates by secreting enzymes and absorbing dissolved nutrients. Mold growth requires moisture, a food source, and temperatures between 40°F and 100°F.

Key Characteristics of Mold

Characteristic	What It Means in Practice
Filamentous structure	Grows as thread-like hyphae that spread quickly across surfaces.
Spore production	Releases thousands of spores that travel through air and start new colonies.
Moisture dependence	Requires persistent dampness, so leaks and humidity drive its growth.
Digestive enzymes	Secretes enzymes that break down wood, drywall, and other cellulose materials.
Color variety	Appears as black, green, white, or orange patches depending on species.
Musty odor	Emits volatile organic compounds that produce a distinct earthy smell.
Surface penetration	Roots can grow deep into porous materials, not just on top.
Rapid reproduction	Can colonize a damp area within 24 to 48 hours.
Allergen release	Produces allergens and mycotoxins that trigger respiratory reactions.
Environmental resilience	Survives harsh conditions by entering a dormant state until moisture returns.

Common Examples of Mold

Aspergillus – commonly found on dust, damp walls, and HVAC systems indoors.
Cladosporium – appears as black or green spots on fabrics, wood, and plants.
Stachybotrys chartarum – black mold that grows on water-damaged cellulose like drywall.
Penicillium – blue-green mold that colonizes food, carpets, and wallpaper adhesive.
Alternaria – fast-spreading mold found in showers, sinks, and damp window frames.
Fusarium – grows on water-damaged carpet and produces potent mycotoxins.
Trichoderma – thrives on wet wood, soil, and paper products after flooding.
Mucor – white or grey fuzzy mold that appears on bread and damp ceiling tiles.
Ulocladium – dark mold that requires very wet conditions, often after water damage.
Aureobasidium – pink or black mold that grows on caulk, grout, and painted surfaces.

Advantages and Limitations of Mold

Advantages	Limitations
Decomposes fallen leaves and dead trees, returning nutrients to soil.	Damages building materials like drywall, wood, and insulation beyond repair.
Produces antibiotics such as penicillin, which save millions of lives.	Releases mycotoxins that can cause chronic respiratory illness in sensitive people.
Used in food production for cheeses like blue cheese and brie.	Triggers allergic reactions including sneezing, coughing, and skin rashes.
Breaks down organic waste in compost piles, accelerating decomposition.	Lowers property value when buyers discover visible growth or musty odors.
Helps ferment soy sauce, sake, and other traditional foods.	Spreads rapidly, making small spots become large infestations within days.
Produces enzymes used in laundry detergents and industrial processing.	Weakens structural integrity of load-bearing wood over time.
Plays a role in soil formation by cycling carbon and nitrogen.	Costs thousands of dollars for professional remediation and replacement of materials.
Creates citric acid used in beverages and cleaning products.	Contaminates food supplies, causing waste and potential poisoning.
Supports plant growth by breaking down organic matter into nutrients.	Produces airborne spores that worsen asthma symptoms significantly.
Used in bioremediation to break down certain pollutants in soil.	Can grow inside walls, remaining hidden until structural damage is severe.

What Is Mildew?

Mildew is a specific type of fungus that grows flat on damp surfaces. It survives by feeding on organic material like fabric, paper, or plant leaves. Mildew exists wherever moisture lingers, making it a common household and agricultural problem.

Definition of Mildew

Mildew is a thin, powdery or downy fungal growth that develops on the surface of plants, paper, fabric, or building materials. It thrives in warm, humid, poorly ventilated environments. Unlike other fungi, mildew remains mostly on the surface, making it easier to remove than deeper-penetrating fungal growth.

Key Characteristics of Mildew

Characteristic	What It Means in Practice
Surface growth	Mildew stays on top of materials, so it rarely compromises structural integrity or requires deep replacement.
Powdery texture	It feels like fine dust or powder, making it easy to wipe away with a cloth.
White or grey colour	You can spot it early because it contrasts clearly against dark or natural surfaces.
Rapid spread	It colonises new areas within 24 to 48 hours when humidity stays above 60 percent.
Musty odour	It releases a distinct earthy, damp smell that alerts you to hidden growth.
Shallow roots	Its root-like structures do not penetrate deeply, so removal is usually straightforward.
Water dependence	It stops spreading once the moisture source is removed and the area dries out.
High spore output	It releases lightweight spores into the air, which can trigger allergy symptoms indoors.
Surface discolouration	It leaves behind yellow, brown, or black stains even after the fungus is wiped away.
Favours humidity	It thrives in bathrooms, basements, and laundry rooms where condensation collects.

Common Examples of Mildew

Powdery mildew on roses – a white coating that distorts new leaves and reduces flowering.
Downy mildew on grapes – a yellow-tinged fuzz that causes leaves to drop prematurely.
Bathroom ceiling mildew – grey patches that form in corners after hot showers.
Mildew on shower curtains – black speckles that appear on the plastic liner within days of use.
Mildew on leather shoes – a grey bloom that develops on stored footwear in damp closets.
Mildew on book pages – brown or white spots that spread across paper in humid libraries.
Mildew on painted walls – dark blotches that appear behind furniture blocking airflow.
Mildew on wooden furniture – a grey powder that forms on unsealed wood in basements.
Mildew on clothing – a white film that grows on damp laundry left in a pile for days.
Mildew on outdoor cushions – green-black patches that form under patio furniture covers.

Advantages and Limitations of Mildew

Advantages	Limitations
Mildew is easy to remove with household bleach or vinegar solutions.	Mildew spores trigger asthma attacks and allergic reactions in sensitive people.
It acts as an early indicator of hidden moisture problems in a building.	It can ruin fabrics, leather goods, and paper documents permanently within weeks.
It is surface-level, so it rarely requires replacing structural materials.	It reappears quickly if the underlying humidity issue is not fixed.
It is visible early, so you can catch it before it spreads widely.	It damages crops and garden plants, reducing yield and killing seedlings.
It is easy to clean with a simple vinegar or detergent spray.	It leaves permanent stains that cannot be bleached out of coloured items.
It can be prevented with basic ventilation and dehumidifier use.	It spreads spores into the air, contaminating other rooms in the house.
It is usually harmless to healthy adults with normal immune systems.	It produces mycotoxins in some species that can cause chronic health issues.
It is a natural decomposer that breaks down dead plant matter.	It is a sign of poor ventilation that can lead to costly wall damage.
It is easy to identify by sight and smell, so you can act fast.	It is difficult to fully eradicate from porous surfaces like wood.
It is a common, well-documented problem with clear cleaning solutions.	It can grow inside walls, where it is hidden and spreads undetected.

Similarities Between Mold and Mildew

Shared Aspect	How Mold and Mildew Are Alike
Fungal Category	Mold and mildew are both types of fungi that reproduce through microscopic spores.
Moisture Requirement	Mold and mildew both require persistent moisture or high humidity to establish and grow.
Organic Food Source	Mold and mildew both feed on organic materials like wood, paper, and drywall.
Spore Dispersal	Mold and mildew both spread by releasing lightweight spores into the surrounding air.
Indoor Locations	Mold and mildew both commonly appear in bathrooms, basements, and kitchens.
Outdoor Habitats	Mold and mildew both thrive outdoors on plant leaves, soil, and decaying vegetation.
Health Triggers	Mold and mildew both can trigger allergic reactions and respiratory irritation in sensitive people.
Surface Staining	Mold and mildew both leave visible discoloration on the surfaces they colonize.
Musty Odor	Mold and mildew both produce a distinct, earthy, musty smell as they metabolize.
Growth Speed	Mold and mildew both can begin colonizing a damp surface within 24 to 48 hours.
Temperature Range	Mold and mildew both prefer warm environments, typically between 60°F and 80°F.
Humidity Threshold	Mold and mildew both become active when indoor humidity consistently exceeds 60 percent.
Poor Ventilation	Mold and mildew both flourish in stagnant air where moisture cannot evaporate quickly.
Porous Materials	Mold and mildew both penetrate porous surfaces, making complete removal difficult without replacement.
Cleaning Agents	Mold and mildew both respond to common household cleaners containing bleach or vinegar.
Prevention Method	Mold and mildew both are best prevented by controlling moisture and improving airflow.
Seasonal Patterns	Mold and mildew both increase in activity during warm, humid seasons like summer.
Structural Damage	Mold and mildew both can weaken building materials over time if left untreated.
Airborne Particles	Mold and mildew both release particles that can degrade indoor air quality significantly.
Visual Inspection	Mold and mildew both are typically first detected through visible patches or spots.
Professional Removal	Mold and mildew both may require professional remediation when infestations cover large areas.
Protective Gear	Mold and mildew both warrant wearing gloves and masks during any cleaning attempt.
Recurrence Risk	Mold and mildew both return quickly if the underlying moisture problem is not fixed.
Testing Methods	Mold and mildew both can be identified through surface sampling or air testing kits.
Natural Habitats	Mold and mildew both play a role in breaking down dead organic matter in nature.
Damp Cloth	Mold and mildew both thrive on consistently damp fabrics like shower curtains and towels.
Caulk and Grout	Mold and mildew both commonly colonize the porous surfaces of bathroom caulk and grout.
Insurance Claims	Mold and mildew both often fall under the same exclusions in standard homeowner policies.
Remediation Cost	Mold and mildew both incur similar costs for cleaning supplies, testing, and professional services.
Long-Term Outcome	Mold and mildew both persist indefinitely unless their environmental moisture source is eliminated.

Mold or Mildew: Which Should You Choose?

You rarely choose either; you identify which one you have to decide your cleanup method. The deciding variable is surface type and growth pattern: powdery and flat means mildew, while fuzzy, raised, or discolored means mold. Test with a drop of bleach; mildew lightens fast, mold resists.

When to Use Mold

Choose Mold when you see black, green, or brown patches that are fuzzy or slimy on wood, drywall, or insulation. Use this term for interior structural damage, water-soaked materials, or growth deeper than the surface. Mold requires professional remediation, containment, and often material removal.

When to Use Mildew

Choose Mildew when you see white, gray, or yellow powder that lies flat on bathroom tile, grout, fabrics, or painted walls. Use this term for surface-level growth on non-porous materials in humid areas. Mildew cleans easily with vinegar, bleach, or commercial spray without cutting out drywall.

Common Misconceptions About Mold and Mildew

Common Myth	The Reality
Mold and mildew are the same organism with two names.	Mold and mildew are different fungi; mildew is a specific surface fungus, while mold is a broader category of fungi.
Mildew is just the early stage of mold growth.	Mildew does not turn into mold; they are distinct fungi types, though both thrive in damp conditions.
All black-colored fungi in a home are toxic black mold.	Mold appears in many colors; only Stachybotrys chartarum is toxic black mold, requiring lab testing for identification.
Bleach kills all mold and mildew permanently.	Bleach kills surface mildew but often fails to penetrate porous materials, allowing mold roots to regrow quickly.
Mold and mildew only grow in visibly dirty or filthy homes.	Mold and mildew grow on any organic surface with moisture, including clean homes with hidden leaks or high humidity.
If you can't see mold, you don't have a mold problem.	Mold grows hidden inside walls, under floors, and behind appliances, often detectable only by musty odors or air testing.
Mildew is harmless, but mold is always dangerous.	Mildew can trigger allergies and asthma, while most mold species are also harmless; only certain molds produce mycotoxins.
Painting over mold or mildew solves the problem.	Painting over mold or mildew seals active fungi beneath the surface, allowing it to continue spreading and damaging the wall.
Mold and mildew die when the area dries out completely.	Mold and mildew become dormant when dry, but spores remain viable and reactivate within 24 hours of moisture returning.
Vinegar and bleach are equally effective against all mold types.	Vinegar kills many mold species on porous surfaces, but bleach is ineffective on wood and drywall where mold roots penetrate.
Mold and mildew only grow in warm, summer temperatures.	Mold and mildew grow in temperatures from 40°F to 100°F, including winter months when condensation forms on cold surfaces.
A musty smell always means visible mold is nearby.	A musty odor indicates mold or mildew spores are present, but the source may be hidden inside walls, ducts, or crawlspaces.
Mildew is always white or gray, while mold is always green or black.	Mildew is typically white or gray, but mold ranges across green, black, brown, orange, pink, and blue depending on species.
Air purifiers completely eliminate mold and mildew from a home.	Air purifiers capture airborne mold spores but cannot remove mold or mildew colonies growing on surfaces or inside materials.
Bathroom mildew is the same species as basement mold.	Bathroom mildew is often Aureobasidium or Cladosporium, while basement mold is often Aspergillus or Penicillium species.
Mold and mildew require standing water to grow.	Mold and mildew grow with just high humidity above 60 percent, condensation, or dampness without any visible standing water.
Newer homes never have mold or mildew problems.	Newer homes suffer mold and mildew from tight construction, poor ventilation, and trapped moisture during the building process.
Mold and mildew are killed by freezing winter temperatures.	Mold and mildew spores survive freezing temperatures and resume active growth when conditions warm and moisture returns.
You can identify mold species just by looking at its color.	Mold color varies with age, surface, and nutrients, so accurate species identification requires microscopic analysis by a professional.
Mold and mildew grow only on organic materials like wood or paper.	Mold and mildew grow on dust, soap scum, and skin cells that settle on tile, glass, plastic, and other non-organic surfaces.
Dehumidifiers alone permanently solve mold and mildew issues.	Dehumidifiers reduce humidity but cannot remove existing mold or mildew colonies, which require physical cleaning and source repair.
Mold and mildew are the same as mildew found on food.	Food mold is often Penicillium or Botrytis, while household mildew is typically Cladosporium or Alternaria growing on surfaces.
Rubbing alcohol is the best treatment for all mold and mildew.	Rubbing alcohol kills surface mold and mildew but evaporates too quickly to penetrate porous materials where mold roots remain.
Mold and mildew problems are purely cosmetic and not health concerns.	Mold and mildew produce allergens and irritants that trigger asthma, respiratory infections, and allergic reactions in sensitive people.
Once mold is removed, it never comes back in the same spot.	Mold returns to the same spot if the moisture source remains unaddressed, as spores are ubiquitous in indoor and outdoor air.
Mildew grows on fabric, while mold only grows on hard surfaces.	Mold grows on fabric, leather, wood, drywall, and carpet, while mildew also grows on hard surfaces like tile grout and shower doors.
Hydrogen peroxide and bleach work identically on mold and mildew.	Hydrogen peroxide penetrates porous surfaces better than bleach, making it more effective on wood and drywall for mold removal.
Mold and mildew spores are only dangerous when the colony is large.	Even small mold or mildew colonies release thousands of spores daily, which can trigger allergic reactions in sensitive individuals.
UV lights installed in HVAC systems kill all mold and mildew.	UV lights kill mold and mildew only on directly exposed surfaces, leaving colonies inside ducts, coils, and wall cavities untouched.
Mold and mildew are killed instantly by any commercial cleaning spray.	Most commercial sprays kill surface mold and mildew but require dwell time and scrubbing to remove roots and prevent regrowth.

Conclusion

Difference Between Mold and Mildew comes down to appearance and surface. Mold is black or green, penetrates materials, and requires professional removal. Mildew is white or gray, stays on surfaces, and cleans with bleach. Pick mold treatment for porous, damaged areas; pick mildew treatment for flat, non-porous surfaces.

FAQs on Difference Between Mold and Mildew

What is the difference between mold and mildew?: Mold is a fuzzy, often black or green fungus that penetrates surfaces, while mildew is a flat, powdery, white or gray fungus that grows on the surface of damp materials.
Is mildew a type of mold?: Yes, mildew is a specific type of mold, but the term usually refers to the common, flat, powdery growth found on plants or bathroom surfaces, whereas mold describes the broader category.
Which is more dangerous to your health, mold or mildew?: Mold is more dangerous because it produces allergens and mycotoxins that can cause serious respiratory issues, while mildew typically causes only mild allergy symptoms like sneezing or a runny nose.
Does bleach effectively kill both mold and mildew?: Bleach kills surface mildew effectively, but it cannot penetrate porous materials to kill mold roots, so it fails to stop mold from regrowing underneath the surface.
What is the typical cost to remove mold versus mildew?: Professional mold removal costs between $500 and $6,000 because it requires containment and remediation, while mildew removal is a simple DIY task costing under $30 for cleaning supplies.
Can you paint over mildew or mold to hide it?: No, painting over mold or mildew traps moisture and allows the growth to spread, so you must clean and treat the affected area with a fungicide before priming and painting.
Is it safe to clean mildew with vinegar instead of commercial products?: Yes, white vinegar is safe and effective because its mild acidity kills up to 82% of mold species, including common mildew, without exposing you to harsh bleach fumes.
What is the most common beginner mistake when treating mold and mildew?: The most common mistake is scrubbing the growth without wearing protective gear, which releases spores into the air and increases your risk of inhaling allergens.
Can you use the same cleaning method for mold on drywall and mildew on tile?: No, you cannot use the same method because drywall is porous and requires replacement or a specialized fungicide, while tile is non-porous and can be cleaned safely with a simple bleach solution.
Can I switch from using a commercial mildew spray to a natural borax solution?: Yes, you can switch to a borax solution because it kills both mold and mildew naturally, and unlike bleach, it leaves a residue that prevents future growth on the treated surface.