Cleaning a masonry wall is the last step in the masonry process, but the effect of all the effort that came before it can be substantially impaired if incorrect products and methods are used. A number of products, for example, are compatible with red-body clay brick, but will discolor admix brick. Pressure washing may be acceptable in some circumstances, but simply using a pressure setting that is too high may etch the face of a coated brick or block, or alter the finish of a limestone product. Great care should be taken to match the proper cleaning technique to the materials used, and to adequately protect other aspects of the building project from the cleaning process. The procedures for cleaning masonry should be given the same concern as every component in the Division 4 specification. Please ask a Riverside Brick commercial representative for guidance.