How to remove mildew with dry sandpaper for wall sanding?

1. Clean the mold on the wall with a dry toothbrush, then clean with a cloth dipped in alcohol.

2. Sand the wall with sandpaper or a knife. First clean the primer, then brush the latex paint.

3. Pour into a spray bottle with bleach powder in a 99:1 ratio of water and spray on the wall.

4. Clean the walls with alcohol. When cleaning, pay attention to keep it ventilated and dry. However, during the rainy season, opening the windows is not recommended. Walls should be dry and dry.