Removes years of dirt and stains from neglected tile and grout surfaces. This concentrated, high alkaline cleaner/stripper is specially formulated to cut through grease, oil based dirt and many synthetic finishes. Use on all types of ceramic tile, grout joints and other masonry surfaces. This product is not for use on natural flagstone, marble, travertine, limestone or any other alkaline sensitive surface. A pre-test for resistance should be performed prior to use.