Interior Wall Mould Treatment. Mix one cup of bleach in a gallon of water apply to the surface and dont rinse. If there were any salt deposits present in the plaster you should also apply a salt neutraliser to the surface as mentioned above either by painting it on or adding it to your plaster.
Rinse thoroughly and dry. Combining 14 cup bleach in 2 cups cold water makes an easy homemade stubborn mold killer. Open a window andor keep a fan.
Basically removing mold behind walls is the same with how to treat mold on wood studs.
Spray the surface until damp but not dripping and let the area air-dry. Open a window andor keep a fan. Combining 14 cup bleach in 2 cups cold water makes an easy homemade stubborn mold killer. Damp-wallscouk Damp on internal walls.