Written & reviewed by Marcus ReedIICRC WRT
Reviewed August 30, 2026· Next review Feb 2027
Quick answer
Partly. Baking soda (sodium bicarbonate) is a mild abrasive and a mild alkali: a paste of it scrubs surface mold off tile, grout, painted walls and sealed surfaces, it absorbs the musty odour, and the alkaline residue it leaves makes the surface a little less hospitable to regrowth. It is not a strong antifungal on its own — vinegar and hydrogen peroxide kill more of what grows — and it does nothing for mold inside drywall, bare wood, carpet or other porous material, which EPA guidance says is removed rather than treated. The method that works: spray white vinegar first, wait ten minutes, then scrub with a baking-soda paste, rinse and dry. Do not mix them in one bottle; the fizz is the two neutralising each other.
What Baking Soda Actually Is
Sodium bicarbonate is a mild alkali and a fine abrasive. Those two properties explain everything it does for mold: the abrasive scrubs surface growth off hard surfaces without scratching most of them, and the alkaline residue it leaves — mold prefers a slightly acidic surface — discourages regrowth a little. It also absorbs odour, which is why it works on the musty smell in a fridge or a closet. What it is not is a strong fungicide. Vinegar and hydrogen peroxide kill more of what grows; baking soda mostly removes it.
That is still useful, because EPA's guidance for hard surfaces is exactly that — scrub the mold off and dry the surface. Baking soda is a good scrub.
The Method That Works
The internet's favourite combination — baking soda and vinegar in one bottle — is the one that does nothing: they react, fizz, and neutralise into salt water. The fizz *feels* like cleaning. Use them in sequence instead.
- 1Vinegar first. Spray undiluted white vinegar over the mold and leave it ten minutes. This is the antifungal step.
- 2Baking-soda paste second. Two parts baking soda to one part water; spread it over the area, leave ten minutes, scrub with a stiff brush.
- 3Rinse and dry. A damp cloth to lift the residue, then dry the surface completely — a wet surface is where the next colony starts.
- 4Optional light spray afterwards: a tablespoon of baking soda dissolved in a spray bottle of water, misted and left to dry, leaves the alkaline film.
Gloves, and an N95 if you are scrubbing dry growth. Never combine either product with bleach.
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Where It's the Right Choice
| Surface | Baking soda? | Note |
|---|---|---|
| Tile, grout, tubs, sinks | yes | the scrub step after vinegar or peroxide; shower mold |
| Painted walls, surface mildew | yes, gently | abrasive — dull marks on glossy paint; wall mold |
| Fridge interior, dishwasher, washing-machine drum | yes | the food-safe cleaner where bleach is wrong; fridge mold |
| Laundry with a mildew smell | yes, added to the wash | half a cup in the drum with detergent; moldy clothes |
| Closets, drawers, shoes — the smell | yes, as an absorber | an open box or a sachet |
| Bare wood | limited | scrubs surface growth; stains in the grain need sanding — mold on wood |
| Drywall the mold has penetrated | no | replaced, not treated — the drywall decision |
| Carpet, padding, insulation | no | EPA: porous materials may need to be discarded |
What It Doesn't Do
It does not reach mold below a surface — the limit shared by every household product. It does not fix the moisture that grew the colony, and it is not a treatment for anything over about 10 square feet, in the HVAC system, or from contaminated water; where the professional line sits does not move for a kitchen-cupboard product.
Bottom Line
Baking soda scrubs mold off hard surfaces, takes the smell, and leaves a slightly unfriendly film behind. Let vinegar or peroxide do the killing first, keep the two out of the same bottle, rinse, dry — and remember that the surfaces it works on are the surfaces any cleaner works on. The moisture is still the job.
Frequently Asked Questions
Does baking soda kill mold or just clean it?
Can you mix baking soda and vinegar to kill mold?
How do you make a baking soda paste for mold?
Is baking soda safe for mold in a fridge, washing machine or on fabric?
Sources
- EPA — Mold Cleanup in Your Home
- EPA — Should I use bleach to clean up mold?
- CDC — Basic Facts About Mold and Dampness
Methodology: How we source and verify data · Report an error
Disclaimer: HearthDry is an independent educational resource. This article is for informational purposes only and does not constitute professional, legal, or insurance advice. Consult licensed professionals before making decisions about your property or insurance claims.
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