Surface mold on drywall can be removed with cleaning solutions, such as hydrogen peroxide, and stain killing primer and paint. The process of treating and painting the affected area can take several days to complete and may need to be repeated later if the mold reappears. Wear a face mask and gloves when cleaning and treating mold.
Identify the cause of the mold
Mold typically grows in humid areas. Locate the source of the moisture and make necessary repairs to prevent mold from growing, and use fans to help dry any moisture present before treating the mold with hydrogen peroxide.
Treat the mold with peroxide
Spray the stain with hydrogen peroxide and scrub the stain gently with a damp sponge. Allow the treated area to dry.
Prepare the surface of the wall
Apply a stain-killing primer and paint to the affected area. Allow the primer to dry for up to 3 days before applying a stain-blocking paint.
Check the results
Surface mold is typically removed with hydrogen peroxide and stain-killing primer, but deeper mold may return within a few weeks. If the mold returns, locate the cause of the problem and retreat the area after water sources have been eliminated.