This concentrated cleaner breaks the adhesion of carbon encrustations and other stains and soiling on clay brick, unpolished granite, sandstone, terra cotta, and more. Proven effective for cleaning the grimiest buildings, Sure Klean Heavy Duty Restoration Cleaner dilutes with clean water at the jobsite for economy and flexibility. Safer than sandblasting, it will not damage masonry when properly used. Prosoco Inc. 800-255-4255.