Our efflorescence cleaner works well on efflorescence. Without knowing chemistry of the sealer on your wall, it is difficult to advise you on how to remove it. There are two basic methods for stripping masonry: mechanical and chemical. While mechanically grinding or sanding your brick is generally reliable, it can be messy and even damage the brick. Chemical strippers are effective, but can be difficult to work with, and the correct chemicals must be used for each application.