What if the wall is wet?

Mixing bleaching powder with water according to the ratio of 1: 99, pouring it into a spray bottle and spraying it on the moldy wall surface can solve the problem of moldy wall surface. If the weather is still wet, bleach and water can be mixed according to the ratio of 1: 20 and smeared on moldy walls. After the wall is dry, smooth it with sandpaper, then brush a layer of waterproof primer and finally a layer of latex paint.