Wear gloves, a mask, and eye protection
Open windows and improve ventilation
Keep children and pets away from the area
Fix the moisture source first
Remove and discard any water-damaged porous materials if heavily moldy
Mix warm water with detergent or use a mold cleaner
Apply the cleaning solution to the moldy wall surface
Scrub the area with a sponge or brush
Wipe away residue with clean water
Dry the wall completely with fans or a dehumidifier
Repeat cleaning if mold remains
Dispose of used rags, sponges, and contaminated debris safely
Clean nearby surfaces to prevent spread
Repaint only after the wall is fully dry
Call a professional if the mold covers a large area or keeps returning