To get black mold off drywall, use a soft brush to scrub the stains with a mixture of water and bleach until the spots are gone. Vacuum up any mold that may have fallen on the floor, and eliminate all excess moisture from the affected rooms as quickly as possible.
- Wash the stains away
Mix your cleaning solution using a 1/2 cup of bleach for every quart of water. Put on a pair of rubber gloves and some form of eye protection, and cover either your clothes or wear clothing that you aren't worried about ruining. Dip a soft brush into the mixture and then scrub the spots until they disappear. Wipe the spots with a clean rag that is safe to bleach.
- Clean up the debris and dry out the area
Vacuum up any signs of mold from the floor using a wet-vac cleaner. Use the same water-bleach solution to clean out the reservoir in the vacuum cleaner if it belongs to you. Use fans and dehumidifiers to dry the area out for at least three days, and check for more mold growth. Repeat Steps 1 and 2 if the mold has returned or spread.
- Apply a new coat of paint
Use a regular latex paint made with a mildew-fighting ingredient to combat the appearance of mold later on. Eliminate sources of moisture, such as open doors or windows and leaks behind the wall, to keep the mold from returning.