Wear gloves, an N95 mask, and eye protection
Open windows and improve ventilation
Keep children and pets away from the area
Fix the moisture source first
Remove loose items from the wall area
Mix warm water with mild detergent
Apply the cleaning solution to the moldy area
Scrub the wall gently with a sponge or soft brush
Wipe the area with a clean damp cloth
Dry the wall completely with towels or a fan
Disinfect the area if needed with a mold-safe cleaner
Replace heavily damaged drywall or wallpaper
Dispose of contaminated materials in sealed bags
Wash hands and clean tools after finishing
Call a professional if the mold covers a large area or keeps returning