PROSOCO Sure Klean® 600 is the No. 1-selling proprietary cleaner for new masonry and is recommended by many brick, block, tile and mortar manufacturers. This general purpose, concentrated acidic cleaner dissolves mortar smears and construction dirt quickly, leaving the masonry clean and uniform with no acid burning or streaking. Safer than muriatic acid for new masonry surfaces. It removes efflorescence on bricks, new concrete and new stone construction. Application is fast and easy with a cold-water rinse. Special wetting agents let larger masonry surfaces be cleaned at one time, eliminating streaking.