Stone & Tile Intensive Cleaner: Concentrated Deep Cleaner, Marble, Limestone, Travertine, Granite, Slate, Ceramic & Porcelain Tile. (2, Gallon) SAFE DEEP CLEANING without damage for all-natural stone & tile surfaces 32 GALLONS OF CLEANER from one gallon of concentrate. NO HARSH ABRASIVES, ACIDS OR SOLVENTS. Even on Polished Marble. MADE IN THE USA. Under strict guidelines. WILL NOT ETCH STONE when used properly. Works on Brick, limestone, Travertine, Concrete, Slate, Granite, Marble, Tile and Grout.