Safety First
Mold can be hazardous. Always wear gloves, a mask, and eye protection when cleaning mold. Ensure the room is well-ventilated.
Bleach Solution
Mix 1 cup of bleach with 1 gallon of water. Apply to the moldy area and let it sit for 15 minutes. Scrub with a brush and rinse thoroughly. Note: Bleach works best on non-porous surfaces like tile.
Vinegar Solution
For a less harsh alternative, spray undiluted white vinegar on the mold. Let it sit for an hour, then scrub and rinse. Vinegar kills about 82% of mold species.
Prevention
The key to stopping mold is controlling moisture. Use your bathroom fan during and after showers. Squeegee the shower walls. Fix any leaks promptly.