How to Get Rid of Mold on a Bathroom Ceiling (and Keep It Off)
Bathroom ceiling mold is usually shower steam with nowhere to go. Clean it safely overhead, then fix the ventilation so you're not doing this every month.
Most bathroom-ceiling mold is a small surface growth caused by shower steam. Wipe it off with detergent and water on a sponge mop or sponge, rinse, and dry the ceiling. Then improve ventilation so it doesn’t return. Wear goggles when cleaning overhead, because drips fall straight down. Don’t use bleach and another cleaner together, and don’t paint over mold. If the patch is larger than about 10 square feet or the ceiling feels soft or stained from a leak above, call a professional.
Stain or active mold?
Before you scrub, figure out what you’re looking at.
| What you see | Likely cause | What it means |
|---|---|---|
| Small black, gray or green specks, often above the shower or in corners | Condensation from showers | Surface mold. A DIY clean plus better ventilation. |
| Fuzzy or raised growth that comes back weeks after cleaning | Ongoing high humidity | The fan isn’t moving enough air, or isn’t run long enough. |
| Yellow-brown ring or blotch, sometimes sagging | A leak from a roof, pipe or upstairs bathroom | Water damage. Find the leak. The drywall may need replacing. |
| Dark stain that wipes clean but returns in the same shape | Mold in or behind the drywall | Likely needs the material cut out. |
A quick check: press gently on the stained area with a gloved finger. A soft, crumbly or bulging ceiling is a sign of water damage, not just steam. Leave that to a pro.
What you need
- Dish detergent and a bucket of warm water
- A sponge mop or a clean sponge on an extension pole. A new mop head is best.
- A sturdy step stool or ladder
- Goggles without vent holes, gloves and an N95 respirator
- Old towels or a drop cloth for the floor and tub
- Clean cloths for rinsing and drying
How to clean mold off a bathroom ceiling
- Prepare the room. Open the window and switch on the exhaust fan. Cover the floor and tub so drips don’t make them slippery. Take the bath mat and towels out.
- Put on goggles, gloves and an N95. Working overhead means drips and particles fall toward your face.
- Use a damp, not dripping, sponge. Wring it well. Too much water soaks into the drywall.
- Wipe gently with detergent and water. Ceiling paint is often flat and can scuff. Work in small sections and rinse the sponge often in clean water.
- Wipe again with plain water, then dry with a clean cloth.
- Let it dry completely. Leave the fan running and the door open.
- Toss or hot-wash the cloths, as their care labels allow.
Use a stable ladder on a dry floor. Don’t stand on the tub edge or toilet. If you can’t reach comfortably, use an extension pole instead of stretching.
Using a bleach solution or a mold cleaner
The EPA does not recommend bleach as a routine mold treatment. Detergent and water remove the growth. If stains remain on a painted ceiling, you can use a store-bought mildew remover or a bleach solution. The CDC says to use no more than 1 cup of household bleach per gallon of water. Follow the label, test on a hidden spot first, and keep the room well ventilated.
Spraying overhead is risky, because the mist drifts into your eyes and lungs. Wipe the product on with a sponge instead.
Never mix bleach with ammonia, vinegar, toilet-bowl cleaners or any other product, and never use two cleaners one after another without rinsing with water in between. Bathrooms are full of acidic cleaners, so this is where accidental mixing happens. Our guide to cleaning products you should never mix lists the main combinations.
If someone swallows, inhales or gets a cleaning product in the eyes, call Poison Control at 1-800-222-1222 (US) or emergency services.
Fix the ventilation
Ceiling mold over a shower is almost always a ventilation problem. Warm, wet air rises, hits the cooler ceiling and condenses there.
- Run the exhaust fan every shower and leave it on until the mirror has cleared, and a bit longer.
- Check the fan works. Hold a single square of toilet paper near the grille while it runs. If the paper isn’t pulled toward the fan, the fan or its duct may be clogged or disconnected. See how to clean a bathroom exhaust fan.
- Make sure the fan vents outside. A fan that dumps moist air into the attic just moves the problem. An electrician or HVAC technician can check this.
- Open the window or door after showers if you don’t have a fan.
- Keep humidity in check. The EPA recommends indoor humidity below 60%, ideally 30% to 50%.
Mold-resistant paint: useful, but last
The EPA advises against painting or caulking over moldy surfaces. Paint on top of mold tends to peel, and the growth continues underneath. Once the ceiling is clean, dry and the ventilation is fixed, repainting with a mold- and mildew-resistant bathroom paint can help. These usually come in satin or semi-gloss finishes, which are easier to wipe. Follow the can’s directions for drying and recoat times, and ventilate while you paint.
When to call a professional
- The moldy area is more than about 10 square feet.
- There’s a water stain from a leak above, or the ceiling is soft or sagging.
- Mold comes back quickly in the same shape even after good cleaning and ventilation.
- Someone in the household has asthma, allergies or a weakened immune system. Ask a doctor before cleaning.
For more on walls, see how to get rid of mold on walls, and the EPA’s guide to mold and moisture.
Bottom line
Use a damp sponge, detergent and water, protect your eyes, and dry the ceiling thoroughly. Use one product at a time and never mix bleach with anything. The real fix is a working, outside-vented exhaust fan used every shower. Paint with mold-resistant paint only after the ceiling is clean and dry.
FAQ
Why does mold keep coming back on my bathroom ceiling?
Usually the fan is too weak, not vented outside, or not run long enough. A hidden leak above the ceiling is the other common cause.
Can I use a spray bottle of mildew remover overhead?
It’s safer to apply it with a sponge or mop. Spray drifts into eyes and lungs. Follow the label and ventilate either way.
Does mold-resistant paint kill mold?
No. It helps resist new growth on a clean surface. It doesn’t fix existing mold or a humidity problem.
Is a small patch of ceiling mold dangerous?
Small surface spots are common in bathrooms and are a DIY job for most people. Anyone with breathing problems should ask a doctor and let someone else clean.
