HG natural stone cement grout film remover is acid free. Therefore cement film and lime film are removed safely from marble and other types of calciferous natural stone. The HG natural stone cement grout film remover can be used on marble and other types of calciferous natural stone. Suitable for travertine, bluestone, granite. Our natural stone cement & lime film remover is also suitable for cement tiles and plastic tiles that contain bits of natural stone such as granite and marble composites.