Aqua Mix Concentrated Stone and Tile Cleaner is a super concentrated, phosphate-free cleaner formulated for everyday use. This neutral cleaner eliminates soap scum build up and hard water deposits and prevents them from returning. Aqua Mix Concentrated Stone and Tile Cleaner is recommended for use on natural stone such as granite, limestone, marble, slate and travertine; ceramic; porcelain; grout; quarry; saltillo; terra cotta; cement pavers; masonry surfaces; and other water-safe surfaces.