TL;DR
Washing soda is sodium carbonate, an alkaline powder with a pH near 11, which makes it a far stronger degreaser than baking soda. It strips cooking grease, boosts laundry detergent, and cuts garage floor oil. It also burns skin on contact, corrodes aluminum, and requires gloves every single time.
Washing Soda Is Not Baking Soda
The two look identical in a jar and behave nothing alike. Baking soda is sodium bicarbonate at a mild pH around 8.3. Washing soda is sodium carbonate at a pH near 11, which on the pH scale is hundreds of times more alkaline.
That difference is the whole point. Grease is an acidic soil, and alkaline cleaners break it down by turning fat into something water soluble. Baking soda barely nudges that reaction. Washing soda drives it.
You can convert one to the other. Baking soda heated in an oven at around 400 degrees F for an hour drives off water and carbon dioxide and leaves sodium carbonate behind, though buying the powder is simpler and cheaper.
What Does Washing Soda Clean?
Washing soda is at its best on grease and heavy soil. It cuts cooking grease on range hoods and backsplashes, degreases concrete and garage floors, boosts laundry detergent on work clothes, and clears grease film from drains as part of a hot water flush.
Where it does real work:
- Range hoods, hood filters, and greasy kitchen walls
- Oven exteriors, stovetop surrounds, and backsplash tile
- Laundry booster, roughly half a cup per load with detergent
- Concrete and garage floor oil, as described in how to degrease a garage floor
- Soaking heavily soiled work clothes, shop rags, and grill grates
- Drain maintenance with plenty of hot water, not as a clog remover
For a mixed formula that combines alkalinity with a surfactant, a DIY kitchen degreaser recipe is the practical version of this chemistry.
Is Washing Soda Dangerous?
Washing soda is a skin and eye irritant that causes chemical burns with prolonged contact and irritates the airway as dust. It is harmful if swallowed. It is not toxic in the way a pesticide is, but it is caustic enough that gloves and eye protection are not optional.
Source: US National Library of Medicine household products database
Practical rules. Wear waterproof gloves every time, and eye protection when mixing or spraying. Avoid raising dust and do not lean over the container while pouring. Ventilate the space. Rinse skin immediately with plenty of water on contact, and get medical care for anything that burns, blisters, or gets in an eye. Call the Poison Help line at 1-800-222-1222 if it is swallowed.
Store it high, locked, and in its original labeled container, well away from children and pets. Basic protection is covered in gloves and masks for cleaning jobs.
What Washing Soda Damages
High pH is destructive on more materials than people expect.
| Material | What happens |
|---|---|
| Aluminum pans, trim, and cookware | Corrodes, darkens, and pits quickly |
| Wool, silk, and other protein fibers | Alkali damages and weakens the fiber |
| Waxed, oiled, or unfinished wood | Strips the finish and raises the grain |
| Polished natural stone | Dulls the polish and can degrade the sealer |
| Painted and varnished surfaces | Softens, dulls, and can lift the finish |
| Fiberglass and soft plastics | Can haze and dull over repeated use |
| Skin | Chemical burns with prolonged contact |
Aluminum is the one that surprises people. A single soak turns an aluminum pan gray and pitted, and there is no undoing it. Test any surface in a hidden spot, and skip washing soda entirely on stone, wood, and anything painted.
What Not to Mix It With
Never mix washing soda with chlorine bleach. Never combine it with any acid, including vinegar and citric acid, because they neutralize each other and you get a weaker cleaner and a mess of fizz.
Washing soda does pair well with a small amount of dish soap. Alkalinity breaks the grease down and the detergent carries it away, and that combination is the basis of most homemade degreasers.
How to Use It Properly
Dilute it. A common starting ratio is one to two tablespoons per gallon of hot water for general degreasing, and about half a cup per load in laundry. Stronger is not better and the residue is harder to rinse.
Use hot water. Sodium carbonate dissolves poorly in cold water and undissolved grit scratches surfaces.
Give it dwell time. Five to ten minutes on baked grease does more than scrubbing hard at minute one.
Rinse thoroughly. Alkaline residue is sticky, attracts new soil, and keeps working on any finish you left it on.
Never store a mixed solution unlabeled. Anything in a spray bottle gets a label with contents and date.
Washing Soda Compared to Borax
Both are alkaline laundry powders and they are not the same tool. Washing soda is far stronger and better at grease. Borax is milder, softens water, and deodorizes. Borax versus washing soda for laundry sorts out which to reach for, and borax and its handling rules covers its own safety profile, which is different again.
FAQ
Is washing soda safe to touch?
No, not bare handed. Sodium carbonate is caustic enough to cause skin irritation quickly and chemical burns with prolonged contact. Wear waterproof gloves for every use, protect your eyes when mixing, and rinse immediately with plenty of water if it contacts skin.
Can I use washing soda instead of baking soda?
Not interchangeably. Washing soda is hundreds of times more alkaline, cuts grease far better, and damages aluminum, wool, wood, and skin. Baking soda is a mild abrasive and deodorizer that is safe to handle. Choose washing soda only when grease or heavy soil is the actual problem.
Will washing soda damage my washing machine?
No. It dissolves fully in warm or hot water and is used in commercial laundry formulas routinely. The risk is to what you put in the machine, not the machine itself. Keep it away from wool, silk, and delicate fabric, and use warm water so it dissolves before the wash starts.
Can washing soda unclog a drain?
It helps with grease film as part of a hot water flush, but it does not clear a real clog. Hair, food, and object blockages are mechanical problems. A drain that backs up repeatedly needs a plumber. Never combine washing soda with a commercial drain product.
Does washing soda disinfect?
No. It has no germ kill claim and no tested standard behind it. It removes grease and soil extremely well, which reduces germs by removal, but a surface that needs disinfecting still needs a labeled disinfectant applied to an already clean surface for its full dwell time.
Where do I find washing soda in a store?
It is usually shelved with laundry boosters rather than with cleaners, sold as washing soda or sodium carbonate in a box. It is also sold as soda ash in pool supply sections, though the pool version is not always packaged for household use. Read the label before buying.
The whole-house equivalent of this routine is covered by house cleaning services.
Washing soda is the answer when baking soda is not strong enough and a solvent is more than you want. Respect the gloves rule, keep it off aluminum and stone, and it does more for kitchen grease than most bottled sprays. When the grease has been building for years, a professional deep clean gets further in a day than a weekend of soaking. Every home is different, so the real number depends on size, condition, and what you want covered. Get a quote and we will walk you through it.