HG tile cement residue remover (product 11) removes cement residue from all types of porous and non-porous ceramic tiles and flagstones, as well as non-calciferous natural stone types such as Norwegian slate, granite and quartzite. This unique product dissolves cement from the tile surface without affecting the cement in the joints; the joints are even strengthened. In addition, it is also suitable for removing rust. For very stubborn cement and mortar residues, we recommend HG cement & mortar residue remover (product 12).