Mold in Bathroom? How to Clean It and Keep It Away
Short answerFor bathroom mold under about 10 square feet, wear an N-95 mask, gloves and goggles, scrub hard surfaces with detergent and water, and dry them completely. Then fix the moisture by running the fan and repairing leaks, because mold returns otherwise. Call a professional for larger areas, hidden mold or health concerns.
Safety first
- Wear an N-95 respirator, long gloves and goggles without vent holes. Open a window, or run a fan that vents outside.
- Never mix bleach with ammonia or other cleaners. It makes a poisonous gas.
- People with asthma, mold allergies, weak immune systems or chronic lung disease should ask a doctor first, and let someone else do the cleanup.
Likely causes
| Cause | How to tell | What fixes it |
|---|---|---|
| Poor ventilation | Mold on the ceiling or upper walls, and a mirror that stays fogged after showers. | Run a fan that vents outside, or open a window, during and after showers. |
| Wet surfaces that stay wet | Mold on grout, caulk or around the tub. | Clean it often and dry it. Replace moldy caulk once the area is clean and dry. |
| Plumbing leak | Mold around a toilet base, under the sink or on a wall that backs up to pipes. | Fix the leak first, then clean up. |
| Hidden mold behind surfaces | A musty smell without visible mold, or peeling paint or wallpaper. | Do not tear into it. Call a professional, since disturbing it can release many spores. |
What you need
- N-95 respirator
- Long rubber or nitrile gloves
- Goggles without vent holes
- Detergent and water
- Scrub brush and rags
- Plastic trash bags
- Hygrometer
How to fix it
- Measure the area. If the mold covers less than about 10 square feet, roughly a 3 foot by 3 foot patch, you can usually clean it yourself. If it is larger, or there was sewage or a lot of water, call a professional.
- Fix the moisture first. Repair any leak and make sure the fan works. Mold returns if you only clean it.
- Put on protection and ventilate. Wear your respirator, gloves and goggles. Open a window or run the exhaust fan. Do not touch mold with bare hands.
- Scrub and dry. Scrub hard surfaces with detergent and water until the mold is gone, then dry them fully. Dead mold can still cause allergic reactions, so you need to remove it, not just kill it. If you choose bleach anyway, use no more than 1 cup per gallon of water, and keep the room ventilated.
- Throw out what cannot be cleaned. Porous items such as moldy ceiling tiles, carpet or soaked drywall may need to go, since mold can be impossible to remove from them. Bag them before moving them through the house.
- Keep it from coming back. Run the fan or open a window during showers, wipe wet surfaces, and clean more often if mold keeps returning. Keep indoor humidity below 60 percent, ideally between 30 and 50 percent. Do not paint or caulk over mold.
When to call a professional
- The mold covers more than about 10 square feet, or there was extensive water damage.
- You suspect mold behind walls or in the HVAC system, or sewage or dirty water caused it.
- Someone in the home has health concerns. Talk to a doctor as well. When you hire, ask about mold experience and references.
What it costs to have fixed
Mold Removal is estimated at $460 to $3,800 nationally. See your state
Common questions
Is black mold in my bathroom dangerous?
Mold can cause a stuffy nose, sore throat, coughing, burning eyes or a rash, and worse reactions in people with asthma or mold allergies. Treat all mold the same way: remove it and fix the moisture.
Does bleach kill mold in a bathroom?
EPA does not recommend bleach as a routine step, because dead mold can still cause reactions and needs to be removed. CDC says if you use it, use no more than 1 cup per gallon of water, and never mix it with other cleaners.
Can I paint over bathroom mold?
No. Paint or caulk over mold will peel and will not solve the problem. Clean and dry the surface, and fix the moisture before you paint.
How do I stop mold on my bathroom ceiling?
Run the exhaust fan or open a window during and after showers. Make sure the fan vents outside. Keep humidity no higher than 50 percent, which CDC recommends.
Is pink stuff in my bathroom mold?
Often it is bacteria. Penn State Extension says pink slime on fixtures, toilet waterlines and shower surfaces is caused by airborne Serratia marcescens bacteria that grow on regularly damp surfaces. It recommends cleaning and drying surfaces often and using a chlorinated cleaner. Source
Do I need to test bathroom mold?
Usually not. The EPA says that if you can see mold growth, sampling is unnecessary in most cases. Clean it and fix the moisture, and if you do sample, have professionals do it. Source
Does insurance cover mold in a bathroom?
Usually only as part of a covered water loss. As an example from Texas, the Texas Department of Insurance says mold on an item damaged by a covered event is covered, but mold from a gradual leak is not, and most policies do not include cleanup and testing, though your insurer may let you add that coverage. Check your own policy and your state insurance department. Source
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Last verified 2026-11-01
Sources
- EPA: A Brief Guide to Mold, Moisture and Your Home — The 10 square foot rule, detergent and water, bleach not recommended as routine, N-95 respirator, gloves, goggles, not painting over mold, humidity targets, venting, and when to call a pro
- CDC: About Mold — Bathroom advice, humidity no higher than 50 percent, bleach no stronger than 1 cup per gallon, never mixing bleach with ammonia, and who is at higher risk
General information, not professional advice. Conditions, codes and prices vary. Turn off power, gas or water before any work, and hire a licensed professional when in doubt. Cost figures are our estimates, not quotes.