How to clean mold in a bathroom?

For small mold patches (under 10 square feet, roughly a 3x3 ft area), you can clean it yourself. Start by scrubbing the moldy surface with detergent and water — a stiff brush works best on tile and grout. For non-porous surfaces like tile, glass, and sealed countertops, an EPA-registered mold cleaner or a bleach solution (1 cup household bleach per gallon of water) is effective. Never mix bleach with ammonia or other cleaners — the fumes are toxic.

The real trick is not just cleaning the mold but controlling what caused it. Bathroom mold needs three things to grow: moisture, warmth, and a food source (soap scum counts). Run the exhaust fan during and for 20 minutes after showers. Fix any leaking faucets or shower heads immediately. Squeegee walls after showering and dry the shower curtain or door. Sealing grout yearly helps prevent mold from taking hold in the porous joints.

If the moldy area is larger than 10 square feet, if it’s inside a wall or ceiling, or if you suspect it’s in your HVAC system, the EPA recommends hiring a professional mold remediation contractor. Black mold (Stachybotrys) is particularly hazardous and should never be disturbed without proper protective gear.

A reliable bathroom mold remover is a small investment that makes this easier: bathroom mold remover.