Prep first
Before you start
- Fix the water source first, then dry everything completely.
- Brush off loose growth outdoors if you can, so spores don't scatter through the house.
- Scrub with mild soap and water, rinse, and dry the counter right away.
Mold on a countertop means moisture is sitting somewhere it shouldn't, so that source must be fixed before the surface can stay clean. Soap and water usually lift the growth, and the counter's material sets the limit beyond that. If you're unsure what your counter is made of, stick with the gentlest step first.
Butcher block soaks up water, so dry the wood right away and don't let liquid sit in the seams. Mildew stains that won't lift with soap usually need a mold remover made for wood, tested on a hidden edge first. If the mark is still there once it's dry, stop scrubbing and call a pro.
Before you start
What countertops can take
Safe to use1
- Water
Use with care3
- Chlorine bleach
- Solvents (alcohol, spot removers)
- Scrubbing and abrasives
Avoid3
- Soaking
- Acids (vinegar, lemon)
- Heat, once the stain is out
7 items
What you'll need
Tap an item to get it on Amazon, or tick what you already have.
- GlovesKeep spores and cleaner off your skin. (opens Amazon)
- Goggles without ventsProtect your eyes while you scrub. (opens Amazon)
- N-95 respiratorKeeps you from breathing in spores. (opens Amazon)
- Mild soap, a soft cloth and a spongeFor the routine wash and the final dry. (opens Amazon)
- 3% hydrogen peroxideThe diluted wipe for the stain. (opens Amazon)
- Plastic wrap and tapeOnly needed if you use the poultice. (opens Amazon)
- Distilled waterFor rinsing off a poultice.
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5 steps
Step by step
Step 1 of 5
Protect yourself before you start
Put on gloves, goggles without vents, and an N-95 respirator so you don't breathe in or touch spores. Open a window if you can so the room stays fresh while you work.
Step 2 of 5
Scrub with mild soap and water
Dampen a cloth or sponge with mild soap and scrub the stained area until the growth lifts. Rinse with warm water, then wipe the spot dry.
Tip. Keep the cloth damp rather than wet, so the water stays on the stain.
Careful. Don't flood seams: the substrate can swell.
Step 3 of 5
Wipe with diluted hydrogen peroxide
Mix 1/2 cup of 3% hydrogen peroxide into a gallon of water. Wipe the solution over the stained area with a clean cloth and let it sit on the stain before you move on.
Tip. Use the mild antiseptic sold at drugstores, not the stronger solution sold for bleaching hair.
Step 4 of 524 to 48 hours
Rinse and dry completely
Rinse the counter with warm water and wipe it dry with a soft cloth. Let the spot air-dry fully, since wet areas dried within 24 to 48 hours usually won't grow mold again.
Step 5 of 5
Repeat if a shadow remains
Once the counter is dry, check the spot in good light. If a shadow is still there, repeat the soap wash and peroxide wipe once before you try the poultice further down.
If you'd rather buy than mix
Best products for mold on countertops
Buy 3% hydrogen peroxide from the drugstore antiseptic aisle, not the stronger solution sold for bleaching hair. For etched surfaces, pick a polishing powder and a felt or burlap buffing pad.
MOLD ARMOR Rapid Clean Remediation
How we picked these: each product is made for this type of stain, its maker doesn't warn against using it on countertops, and its directions fit the steps above.
Finished the steps? How does it look?
Nice work. Let it dry completely and check it again in good light. Here is what done looks like:
How to tell it's really gone →A faint mark usually needs one more round, not a stronger product.
Heavy buildup usually takes more than one round.
Heavy or long-standing buildup →When to call a professional →How to tell it's working
The stain should look lighter and blend into the surface after each pass. Once the counter is dry and shows no dark shadow, the mold is gone. If the mark stays dark after several rounds, it may have soaked into the surface, and that is where the poultice comes in.
What changes for yours
Adjust for your countertops
Laminate
Laminate takes the full routine: a damp cloth with mild soap, a warm rinse and a wipe dry. Keep acidic cleaners off it, because they damage the surface, and skip the poultice unless the mark has really set.
Work in small areas so the water doesn't spread toward the seams, and dry each area before you move on. If a faint mark stays after drying, repeat the wash once before you try anything stronger.
Solid surface
Start with the mild soap wash, and if the finish dulls or changes, stop there, because that tells you the surface needs a gentler approach. Keep paint removers, thinners and acetone-based cleaners away from it, and wash off quickly if one touches it.
Stronger work goes to the poultice, and any etched area can be buffed back with polishing powder and a buffing pad.
Natural stone
Natural stone takes the diluted peroxide wipe from the steps, so you don't need anything harsher. Keep the wipe to that solution and rinse it well so no residue dulls the polish.
If a dull patch stays after the wipe dries, move to the poultice rather than a stronger cleaner. Give each poultice the full 24 to 48 hours before you judge the result.
Butcher block
Wood is porous, so keep the routine to the mild soap wipe. Dampen a cloth with mild soap, wipe the board, then rinse lightly and dry it right away with a soft cloth.
Don't leave the wood wet, because moisture is what lets mold return. Mold can get into porous material, and if the mark doesn't lift after a dry, replacing the board may be the only real fix.
Grout lines on tile
Grout is porous, so mold can settle in the lines even when the tile looks clean. Scrub the lines with the same mild soap wash and dry them fully before you judge the result.
The grout lines need their own routine, so see the grout guide for that. Keep the tile face on the wash-and-dry routine above.
Heavy or long-standing buildup
An old mold mark that didn't lift with the wash may have worked into the surface, and that's when a poultice is worth trying. Make a thick paste the consistency of peanut butter from the diluted peroxide and a powder, then spread it 1/4 to 1/2 inch thick, reaching about one inch past the stain.
Once it's spread, cover the paste with plastic and tape the edges to seal it. Let it dry thoroughly for about 24 to 48 hours. Then remove it, rinse with distilled water, and buff the spot dry with a soft cloth.
If a shadow still shows, repeat the poultice, since a difficult stain can take up to five applications. If the surface looks etched afterward, polish it with polishing powder and buff with a burlap or felt pad.
Vinegar, baking soda, peroxide and more
Do home remedies work on mold on countertops?
Several home remedies come up for mold on counters, but many of them are fabric methods or only suit certain surfaces. Most of these suit only certain surfaces, so check the countertop material before choosing one.
Works1Helps1Skip3Avoid1
What makes it worse
Mistakes to avoid
Don't mix bleach with ammonia
Never combine chlorine bleach with ammonia or any cleaner that contains it, because the mix can give off toxic fumes. Use one product, rinse the surface, and only then choose the next.
Don't rely on bleach as a routine cleaner
Chlorine bleach isn't recommended as a routine practice, so reach for it only when nothing else has worked. If you do use it, ventilate the room and exhaust the air outdoors.
Don't scrub with steel wool
Steel wool and abrasive pads scratch laminate, and the metal can rust and stain the surface. Use a soft cloth or sponge with mild soap instead.
Don't set hot pans on the counter
Pots straight from the oven or a burner can crack or blister laminate. Set a trivet between the pan and the surface.
Don't paint or caulk over mold
Clean and dry the surface first, because paint over mold is likely to peel. Wait until the spot is fully dry before you seal or cover it.
Don't take on a large area alone
Past about 10 square feet, or if the mold came from sewage or contaminated water, hire an experienced professional. Follow remediation guidance for the cleanup.
When to call a professional
Deep cuts in solid surface, and gloss or semi-gloss finishes, may need a certified fabricator, and a service charge may apply. If the surface stays etched after the polishing powder, a fabricator is the next call.
Questions
Is mold on a countertop dangerous to breathe?
It can be, especially when you scrub or brush dry growth and send spores into the air. Wear gloves, goggles and an N-95 respirator while you work, and keep the room ventilated.
Will the stain come out for good?
Often, if you catch it early. Mold can cause staining and cosmetic damage that can't always be reversed, so a faint shadow may stay even after the growth is gone.
How do I stop mold coming back on the counter?
Fix the water source first, then dry the counter completely. Wet areas dried within 24 to 48 hours usually won't grow mold.
Can I use bleach on a mold stain?
It's not the first choice, because it isn't a routine cleaner and can discolor or damage the surface if left on too long. Start with the soap wash and the peroxide wipe, and save bleach for a last resort on laminate only.
Can I use vinegar on a stone counter?
No. Vinegar is off-limits on marble, limestone, travertine, granite and cement grout, because acid can damage these surfaces. Use the diluted peroxide wipe instead, and rinse it off well so no residue is left behind.
How long does a poultice take to work?
Each poultice stays on for about 24 to 48 hours. A stubborn stain may need up to five applications before it's gone.
Is the same wash safe on butcher block?
Stick to the mild soap wipe and dry the board quickly. Wood is porous, so test any stronger step on a hidden spot before you use it.
Mold on other materials
Other stains on countertops
Start from the bigger picture
How we know this
Every method, amount and warning here comes from university extension services, industry bodies and product makers. We read them, check every step for unsafe combinations and changed amounts, and write it up so you can follow it.