Difference Between

Difference Between Baking Soda and Washing Soda

Nex Virox Team
Written byNex Virox Team
Editorial Team
Varshal Nirbhavane
Senior SEO & Organic Growth Professional · 5+ years
20 min read
Quick answer

The main difference between Baking Soda and Washing Soda is that baking soda is a mild, single-ingredient leavening agent, while washing soda is a harsh, highly alkaline cleaning booster. Baking Soda is sodium bicarbonate, a fine powder used in cooking and gentle scrubbing, while Washing Soda is sodium carbonate, a coarse, caustic powder used for heavy-duty laundry and degreasing.

Key takeaways

  • Core distinction: Baking soda is sodium bicarbonate; washing soda is sodium carbonate, a stronger alkali.
  • How each works: Baking soda gently neutralizes acids; washing soda breaks down grease and lifts stains aggressively.
  • Performance and cost: Washing soda cleans tougher messes faster but costs slightly more per load than baking soda.
  • Best-fit use case: Choose baking soda for deodorizing fridges; pick washing soda for laundry and oven grease.
  • Most common mistake: Substituting baking soda for washing soda in laundry yields weak cleaning results and wasted effort.

Difference Between Baking Soda and Washing Soda: Comparison Table

AspectBaking SodaWashing Soda
DefinitionSodium bicarbonate (NaHCO₃), a mild alkaline salt with a pH near 8.1 in solution.Sodium carbonate (Na₂CO₃), a stronger alkaline salt with a pH near 11.6 in solution.
Primary PurposeLeavening baked goods, deodorizing, and gentle household scrubbing.Heavy-duty laundry booster, grease cutter, and hard-water softener.
Core MechanismReleases carbon dioxide gas when heated or mixed with acid to leaven batters.Hydrolyzes in water to create a high-alkaline solution that breaks grease bonds.
Chemical FormulaNaHCO₃, one sodium atom, one hydrogen, one carbon, three oxygen atoms.Na₂CO₃, two sodium atoms, one carbon, three oxygen atoms.
pH LevelMildly alkaline, pH 8.1, safe for skin contact during normal cooking use.Strongly alkaline, pH 11.6, requires gloves to avoid skin irritation.
Water SolubilityDissolves slowly in cold water, about 9.6 grams per 100 mL at 20°C.Dissolves readily in cold water, about 21.5 grams per 100 mL at 20°C.
Heat ReactionDecomposes above 80°C, releasing CO₂ and turning into sodium carbonate.Stable up to 851°C before melting, no gas released during heating.
Acid ReactionFizzes vigorously with vinegar, lemon juice, or buttermilk to produce bubbles.React with acids releases heat but produces no leavening gas for baking.
Cleaning PowerMild abrasive that lifts light stains and neutralizes odors on surfaces.Strong degreaser that dissolves baked-on food and soap scum quickly.
Laundry UseSoftens fabrics mildly and removes perspiration odors from athletic wear.Boosts detergent power, removes stains, and prevents gray dinginess in whites.
Grease CuttingRequires prolonged soaking to break down light oil films on dishes.Emulsifies heavy grease instantly, ideal for stovetops and oven racks.
Hard Water EffectHas minimal chelating ability, does not significantly soften hard water minerals.Precipitates calcium and magnesium ions, effectively softening hard water for washing.
DeodorizingAbsorbs and neutralizes acidic odor molecules in refrigerators, carpets, and shoes.Kills odor-causing bacteria on surfaces but does not absorb airborne smells.
Skin SafetyGentle enough for diaper rash pastes and mild exfoliants when diluted.Irritating to skin and eyes; contact requires immediate rinsing with water.
Food SafetyFDA-approved food additive, safe for baking, cooking, and teeth whitening.Not safe for consumption; ingestion causes nausea, vomiting, and digestive burns.
Cost Per PoundRetails around $1–$2 per pound in grocery stores, very affordable for households.Retails around $2–$4 per pound in cleaning aisles, slightly pricier per use.
Packaging FormSold as fine white powder in cardboard boxes, often with a pour spout.Sold as dense crystals or coarse powder in plastic tubs or cardboard cartons.
Storage LifeLasts indefinitely when kept dry, but loses leavening power after 6 months open.Stable for years in a sealed container; absorbs moisture and clumps if exposed.
Common BrandsArm & Hammer, Bob's Red Mill, and generic grocery store house brands.Arm & Hammer Super Washing Soda, Dri-Pak, and generic hardware store brands.
Drain CleaningMild fizzing action only; cannot dissolve hair, soap scum, or organic blockages.Strong alkaline solution breaks down grease and soap buildup in slow drains.
Oven CleaningForms a paste that scrubs light spills but struggles with carbonized baked-on residue.Dissolves burnt-on grease in minutes when mixed with hot water and soaked.
Silver PolishReacts with aluminum foil and hot water to remove tarnish via ion transfer.Too harsh for silver; strips protective patina and can pit soft metals.
Fabric SofteningAdds a cup to rinse cycle to reduce static and soften towels naturally.Does not soften fabrics; leaves them stiffer but cleaner and brighter.
Stain RemovalLifts fresh coffee, tea, and fruit stains when applied as a quick paste.Breaks down set-in grass, blood, and oil stains during pre-soak cycles.
Paint RemovalNo meaningful effect on dried latex or oil-based paint surfaces.Softens latex paint for easy scraping; not effective on epoxy or enamel.
Tile GroutWitens grout lines mildly with a soft brush and gentle scrubbing action.Strips soap scum and mildew stains from grout, restoring original white color.
Pet MessesNeutralizes urine odors on carpets and fabrics without damaging fibers.Too caustic for fabrics; disinfects concrete or outdoor surfaces but may bleach.
CompatibilitySafe with wool, silk, aluminum, and most delicate fabrics when diluted.Damages wool, silk, aluminum, and painted surfaces; use only on cotton and synthetics.
Typical UsersHome bakers, parents, eco-friendly cleaners, and natural remedy enthusiasts.Laundry-heavy households, professional cleaners, and mechanics degreasing tools.
LimitationToo weak for heavy grease, hard-water scale, and set-in protein stains.Too caustic for food prep, delicate fabrics, and daily skin contact.
Best-Fit ScenarioChoose for cooking, gentle deodorizing, and light daily cleaning tasks.Choose for heavy laundry loads, grease removal, and hard-water fighting.

What Is Baking Soda?

Baking soda is a fine white powder that chemists call sodium bicarbonate. It acts as a leavening agent in baked goods and a gentle cleaner in homes. It exists to release carbon dioxide gas when mixed with acid and moisture.

Definition of Baking Soda

Sodium bicarbonate (NaHCO₃) is an alkaline salt that reacts with acids to produce carbon dioxide, water, and a salt. This reaction creates lift in batters and neutralises odours. Its pH of about 8.4 makes it a mild base safe for food use.

Key Characteristics of Baking Soda

CharacteristicWhat It Means in Practice
Mild alkalinityIts pH near 8.4 neutralises mild acids without damaging skin or surfaces.
Fine particle sizeThe tiny crystals dissolve quickly in water, making it easy to mix into batters.
Food-safe gradeIt is approved for human consumption, so it appears in recipes and toothpaste.
Carbon dioxide releaseWhen heated or acidified, it produces gas that expands dough and batters.
Odour absorptionIt traps acidic odour molecules in its structure, neutralising smells in fridges.
Mild abrasiveIts soft crystals scrub grime off sinks and pans without scratching surfaces.
Water solubilityIt dissolves fully in water, leaving no gritty residue after rinsing.
Heat sensitivityIt decomposes above 80°C, releasing gas even without an acid present.
Low costIt is inexpensive per kilogram, making it a budget-friendly household staple.
Short shelf lifeIt loses potency after opening, so it needs testing before baking use.

Common Examples of Baking Soda

  • Arm & Hammer Baking Soda – the most widely sold brand in US supermarkets for cooking and cleaning.
  • Rumford Baking Soda – an aluminium-free leavening powder trusted by professional bakers for consistent rise.
  • Bob's Red Mill Baking Soda – a bulk option popular with home bakers who make large batches of bread.
  • Fridge deodoriser box – an open container placed on a shelf to absorb food odours for up to 30 days.
  • Homemade volcano science kit – a classic classroom experiment mixing baking soda with vinegar to erupt.
  • Denture cleaning soak – a dissolved tablet or powder that lifts plaque and stains from dental appliances overnight.
  • Antacid remedy – a half-teaspoon in water that relieves heartburn by neutralising stomach acid.
  • Carpet freshener – a dry sprinkle left for 15 minutes then vacuumed to remove pet and musty odours.
  • Oven cleaner paste – a mix with water that cuts baked-on grease without harsh chemical fumes.
  • Laundry booster – a half-cup added to a wash cycle that softens hard water and brightens whites.

Advantages and Limitations of Baking Soda

AdvantagesLimitations
It leavens baked goods reliably when paired with an acid like buttermilk or lemon juice.It leaves a soapy, metallic taste if too much is used or acid is insufficient.
It neutralises a wide range of odours, from fridge smells to sweaty gym bags.It stops working after a few weeks once it absorbs moisture and carbon dioxide.
It is a gentle abrasive that cleans stainless steel and ceramic without scratching.It cannot dissolve grease or oil, so it fails on baked-on fat without added detergent.
It is safe to ingest in small doses, making it useful for heartburn and mouth rinses.It contains high sodium, so it is unsafe for people on low-salt or low-sodium diets.
It is cheap and widely available in every grocery store and pharmacy worldwide.It reacts with aluminium, causing dark spots or pitting on uncoated aluminium cookware.
It removes pesticide residues from fruits and vegetables when soaked in water.It is ineffective against mould spores, which require bleach or specialised fungicides.
It softens hard water, helping soap lather better and reducing mineral deposits.It can irritate sensitive skin if left on for long periods without rinsing.
It extinguishes small grease fires by releasing carbon dioxide that smothers flames.It is useless on electrical fires and can spread a grease fire if thrown carelessly.
It deodorises carpets and upholstery with a simple sprinkle-and-vacuum routine.It leaves a white residue on dark fabrics if not fully rinsed from laundry.
It is biodegradable and non-toxic, so it is safe for septic systems and gardens.It has no disinfectant power, so it cannot kill bacteria or viruses on surfaces.

What Is Washing Soda?

Washing soda is a heavy-duty alkaline cleaner, chemically known as sodium carbonate. It softens hard water and cuts through grease, oil, and stubborn stains. It exists to boost laundry detergents and handle cleaning jobs that milder household products cannot manage.

Definition of Washing Soda

Washing soda is the common name for sodium carbonate (Na₂CO₃), a water-soluble sodium salt of carbonic acid. It forms a strongly alkaline solution with a pH around 11. This high alkalinity enables it to saponify fats and emulsify oils, making it a potent industrial and household degreaser.

Key Characteristics of Washing Soda

CharacteristicWhat It Means in Practice
High alkalinityIts pH near 11 dissolves grease and breaks down acidic stains that neutral cleaners miss.
Water softenerIt binds calcium and magnesium ions so detergents lather and clean far more effectively.
Strong degreaserIt saponifies fats into soap, lifting heavy cooking oils from surfaces and fabrics.
Stain removerIt oxidises and lifts tannin stains like coffee, tea, and berry juice from washable fabrics.
Coarse powder formIts gritty texture provides mild abrasion for scrubbing sinks, tubs, and cookware.
Highly causticIt can irritate skin and eyes, so gloves and ventilation are required for safe use.
Not for aluminumIts alkalinity corrodes aluminum cookware and surfaces, causing pitting and discolouration.
Rinses residue-freeIt dissolves fully in water, leaving no soapy film behind on clothes or hard surfaces.
Low costIt is an inexpensive bulk chemical sold in large boxes for everyday household chores.
Environmentally safeIt breaks down into harmless sodium and carbonate compounds in wastewater systems.

Common Examples of Washing Soda

  • Arm & Hammer Super Washing Soda – the most widely sold retail brand, used as a laundry booster in North American homes.
  • Dri-Pak Soda Crystals – a leading UK product used for soaking nappies, removing grease, and clearing drains.
  • Industrial textile processing – factories use bulk sodium carbonate to regulate pH during fabric dyeing and bleaching.
  • Glass manufacturing – sodium carbonate is a key flux ingredient that lowers the melting point of silica sand.
  • Pool pH adjustment – pool owners add washing soda to raise total alkalinity and stabilise water chemistry.
  • Homemade laundry detergent – DIY recipes combine washing soda with soap flakes and borax for a cheap cleaning powder.
  • Drain unclogging – a hot washing soda solution dissolves built-up soap scum and hair grease in slow drains.
  • Oven and grill cleaning – a washing soda paste breaks down baked-on carbonised food without harsh chemical fumes.
  • Camping dishwashing – outdoor enthusiasts use it to cut grease from cookware using minimal water.
  • Hard water correction – households with mineral-rich well water add it to every load to prevent grey laundry film.

Advantages and Limitations of Washing Soda

AdvantagesLimitations
It dramatically boosts detergent power in hard water by softening the water first.It is harsh on skin and can cause chemical burns with prolonged or repeated contact.
It removes set-in grease and oil stains from work clothes and kitchen linens.It permanently corrodes aluminum, so it ruins pots, pans, and foil in minutes.
It is inexpensive per wash compared to commercial stain removers and boosters.It fades and weakens delicate fabrics like silk, wool, and spandex very quickly.
It works as a natural, non-toxic cleaner that is safe for septic systems.It can damage painted, waxed, or varnished surfaces by stripping the protective coating.
It unblocks drains and removes soap scum without caustic chemical fumes.It leaves a powdery white residue if not rinsed thoroughly from surfaces.
It dissolves food and protein stains that ordinary detergents leave behind.It is dangerous if inhaled as a fine dust, causing respiratory tract irritation.
It is versatile for laundry, cleaning, and even some food-prep sanitising tasks.It is ineffective on rust, mould, and heavy mineral scale that need acid-based cleaners.
It is biodegradable and breaks down into harmless compounds in the environment.It is unsafe around children and pets if left accessible, as ingestion is toxic.
It enhances the performance of homemade and eco-friendly cleaning recipes.It is not a disinfectant and does not kill bacteria or viruses on its own.
It is widely available in grocery and hardware stores in bulk packaging.It is a strong alkali that can etch glass and damage glazed ceramic tiles over time.

Similarities Between Baking Soda and Washing Soda

Shared AspectHow Baking Soda and Washing Soda Are Alike
Chemical originBaking soda and washing soda are both sodium-based compounds derived from natural trona ore mining.
Alkaline natureBaking soda and washing soda both dissolve in water to create alkaline solutions.
Household staplesBaking soda and washing soda both belong in most household cleaning supply cabinets.
Powder formBaking soda and washing soda both appear as fine white crystalline powders at room temperature.
Water softeningBaking soda and washing soda both help soften hard water during laundry cycles.
Odor neutralizersBaking soda and washing soda both absorb and neutralize unpleasant household odors effectively.
Laundry boostersBaking soda and washing soda both enhance detergent performance when added to wash loads.
Non-toxic profileBaking soda and washing soda both pose low toxicity risks for typical household applications.
BiodegradableBaking soda and washing soda both break down naturally without harming aquatic environments.
Cheap materialsBaking soda and washing soda both cost just a few dollars per standard box.
Long shelf lifeBaking soda and washing soda both remain effective indefinitely when stored in dry containers.
Multi-surface useBaking soda and washing soda both clean tile, glass, metal and fabric surfaces safely.
Mild abrasivesBaking soda and washing soda both provide gentle scouring action without scratching most finishes.
Grease cuttersBaking soda and washing soda both break down kitchen grease and baked-on food residue.
Stain removersBaking soda and washing soda both lift protein-based and organic stains from clothing fibers.
Drain cleanersBaking soda and washing soda both clear slow drains when combined with hot water.
Oven cleanersBaking soda and washing soda both form effective pastes for removing burnt oven debris.
Grout scrubbersBaking soda and washing soda both whiten grout lines when applied with a stiff brush.
Pet stain treatmentBaking soda and washing soda both deodorize and clean carpets after pet accidents.
Diaper soakersBaking soda and washing soda both pre-soak cloth diapers to remove ammonia buildup.
Garden helpersBaking soda and washing soda both treat fungal issues on rose and tomato plants.
Glass cleanersBaking soda and washing soda both cut hard water film from shower doors and mirrors.
Mold removersBaking soda and washing soda both kill surface mold and mildew in damp bathrooms.
Cookware restorersBaking soda and washing soda both remove polymerized oil from stainless steel pans.
Fire extinguishersBaking soda and washing soda both smother small grease fires by releasing carbon dioxide.
pH buffersBaking soda and washing soda both stabilize pH levels in swimming pool water testing.
Recyclable packagingBaking soda and washing soda both ship in recyclable cardboard boxes with minimal plastic.
Dual-purpose useBaking soda and washing soda both serve cleaning and personal care applications equally well.
Routine maintenanceBaking soda and washing soda both require simple dry storage away from moisture.
Lifetime valueBaking soda and washing soda both deliver years of service because neither compound expires.

Baking Soda or Washing Soda: Which Should You Choose?

The one variable that decides it for most people is cleaning power versus safety. Baking Soda is the mild, food-safe choice for gentle scrubbing and deodorizing. Washing Soda is the heavy-duty alkali for tough grease, stains, and laundry buildup. Pick the tool that matches the mess.

When to Use Baking Soda

Choose Baking Soda when you need gentle abrasion on delicate surfaces, like stainless steel, countertops, or fiberglass. It is also the right call for deodorizing refrigerators, carpets, and shoes where you cannot rinse. Its mild pH makes it safe around kids, pets, and food-prep areas.

When to Use Washing Soda

Choose Washing Soda when facing heavy grease, set-in stains, or hard-water film that Baking Soda cannot break down. It excels in laundry boosters for oily work clothes and towels. Use it for unclogging drains or stripping residue from cloth diapers, where its high alkalinity is an advantage.

Common Misconceptions About Baking Soda and Washing Soda

Common MythThe Reality
Baking soda and washing soda are basically the same chemical.Baking soda is sodium bicarbonate, while washing soda is sodium carbonate; they differ by one carbon atom and one hydrogen atom.
You can swap baking soda for washing soda in any recipe.Washing soda is far more alkaline with a pH near 11, while baking soda sits near pH 8; swapping changes results dramatically.
Washing soda is just a stronger version of baking soda.Washing soda is not stronger baking soda; it is a distinct compound with different solubility, alkalinity, and cleaning mechanisms.
Baking soda and washing soda both work identically in laundry.Washing soda softens hard water by binding calcium and magnesium, while baking soda mainly deodorizes and mildly buffers pH.
You can make washing soda by baking baking soda in the oven.Heating baking soda at 400°F drives off carbon dioxide and water, converting it into washing soda, but the process is real.
Baking soda is safe to eat, so washing soda is safe too.Washing soda is caustic and not food-safe; ingesting it can cause severe burns, while baking soda is a common food ingredient.
Washing soda is just baking soda with extra water added.Washing soda contains no extra water; it is anhydrous sodium carbonate, while baking soda is a distinct bicarbonate salt.
Both compounds react identically with vinegar or acid.Baking soda fizzes vigorously with acid producing carbon dioxide, but washing soda reacts more slowly and produces less visible bubbling.
Baking soda cannot clean grease or oil at all.Baking soda does cut light grease through mild abrasion and alkalinity, but washing soda emulsifies heavy grease far more effectively.
Washing soda is too harsh for any fabric or surface.Washing soda is safe for most cotton and synthetic fabrics, but it can damage wool, silk, and aluminum surfaces.
Baking soda and washing soda have identical pH levels.Baking soda has a pH around 8.3, while washing soda has a pH near 11.3, making washing soda roughly a thousand times more alkaline.
You can use washing soda in baking as a leavening agent.Washing soda is not a leavening agent; it lacks the acid-neutralizing profile of baking soda and tastes bitter and soapy.
Baking soda is useless for removing stains from clothing.Baking soda lifts many protein and odor stains, but washing soda tackles tougher tannin and grease stains more aggressively.
Washing soda dissolves in water exactly like baking soda does.Washing soda dissolves readily in warm water but can clump in cold water, while baking soda dissolves more uniformly across temperatures.
Both powders are equally effective at neutralizing odors.Baking soda neutralizes acidic odors in refrigerators and carpets, while washing soda is less effective for odor absorption and more for cleaning.
Washing soda is a synthetic chemical invented by detergent companies.Washing soda occurs naturally as the mineral natron and has been used for cleaning since ancient Egyptian times.
Baking soda cannot soften hard water for laundry.Baking soda does soften water slightly by raising pH, but washing soda is far more effective at precipitating hard-water minerals.
You should store baking soda and washing soda in identical conditions.Baking soda absorbs moisture and odors easily, while washing soda is more stable but can form hard lumps when exposed to humidity.
Washing soda is just a brand name for baking soda.Washing soda is not a brand; it is the common name for sodium carbonate, a chemical distinct from sodium bicarbonate.
Baking soda is too weak to clean ovens or burnt pans.Baking soda with water forms a paste that lifts burnt residue, but washing soda cuts through baked-on grease much faster.
Both compounds are equally safe for pets and children.Baking soda is generally low-risk in small amounts, while washing soda is caustic and can cause serious burns if ingested by pets or kids.
Washing soda cannot be used for personal care like bathing.Washing soda is not for skin contact in high concentrations, while baking soda is commonly used in baths and as a gentle exfoliant.
Baking soda and washing soda have the same molecular weight.Baking soda has a molecular weight of about 84, while washing soda is about 106, meaning equal masses contain different numbers of molecules.
You can substitute washing soda for baking soda in toothpaste.Washing soda is far too abrasive and alkaline for oral use, while baking soda is a mild abrasive found in many toothpaste formulas.
Washing soda is completely harmless to the environment.Washing soda is generally eco-friendly but can raise soil and water pH significantly, while baking soda has a milder environmental footprint.
Baking soda cannot remove pesticide residues from produce.Baking soda solutions do remove some pesticide residue, but washing soda is not recommended for food washing due to its caustic nature.
Both compounds are equally effective at unclogging drains.Baking soda with vinegar creates pressure to clear minor clogs, while washing soda alone is less fizzy and works mainly as a degreaser.
Washing soda is the same as borax or laundry booster.Washing soda is sodium carbonate, while borax is sodium borate; both boost laundry but have different chemistries and safety profiles.
Baking soda loses all cleaning power when it gets wet.Baking soda becomes a mild alkaline solution when wet, which still deodorizes and cleans, though its abrasive scrubbing action is reduced.
You can use washing soda to make homemade baking powder.Washing soda cannot replace baking soda in baking powder because it lacks the correct acid reaction and is unsafe for consumption.

Conclusion

Difference Between Baking Soda and Washing Soda comes down to alkalinity. Baking soda is milder, making it ideal for cooking and gentle cleaning. Washing soda is far stronger, so choose it for tough laundry stains and heavy degreasing. Pick baking soda for food-safe tasks; pick washing soda for heavy-duty cleaning.

FAQs on Difference Between Baking Soda and Washing Soda

What is the main difference between baking soda and washing soda?
The main difference is chemical makeup, where baking soda is sodium bicarbonate and washing soda is sodium carbonate, making washing soda significantly more alkaline and stronger for cleaning.
Which is better for cleaning, baking soda or washing soda?
Washing soda is better for heavy-duty cleaning like laundry stains and grease because its higher pH cuts through grime, while baking soda is better for gentle scrubbing and deodorizing.
Is washing soda more expensive than baking soda?
Washing soda is generally cheaper per ounce than baking soda, but baking soda is more widely available in grocery stores, whereas washing soda often requires a trip to a hardware or big-box store.
Is it safe to use washing soda on all fabrics?
No, washing soda is not safe for all fabrics because its high alkalinity can damage silk, wool, and delicate synthetics, so always test on an inconspicuous area or stick to sturdy cottons.
Can I use baking soda instead of washing soda in my laundry?
Yes, you can use baking soda instead of washing soda in laundry, but expect weaker results because baking soda is a milder alkali that will not remove heavy stains or brighten whites as effectively.
What is the beginner mistake when using washing soda?
The most common beginner mistake is using too much washing soda, which leaves a chalky residue on clothes and can irritate sensitive skin, so start with just one tablespoon per load.
Are baking soda and washing soda interchangeable in recipes?
No, baking soda and washing soda are not interchangeable in recipes because washing soda is toxic to ingest and lacks the acid-reacting properties needed for leavening baked goods.
How do I use washing soda to remove tough laundry stains?
To remove tough stains, dissolve half a cup of washing soda in hot water and soak the garment for 30 minutes before washing, which breaks down oil and protein-based marks effectively.
Can I switch from baking soda to washing soda for deodorizing my fridge?
No, you should not switch to washing soda for fridge deodorizing because it is caustic and could contaminate food, whereas baking soda is food-safe and specifically designed for that purpose.
What is the pH difference between baking soda and washing soda?
Baking soda has a mild pH of around 8, while washing soda has a highly alkaline pH of about 11, which explains why washing soda is far more corrosive and effective on tough grime.