Washing and preparing surfaces

When the coating is removed from the wall or door, then the entire surface must be washed from fat or remains of wallpaper glue. If the surface remains dirty, then the paint will peel off, and the wallpaper will peel off. When it is planned to paint the wall according to the old layer, then it must be washed up so that the water drains along the wet wall and does not leave the drones, otherwise they can be shone through a new layer of paint of the emulsion.