HG Cement Mortar & Efflorescence Remover 1L Cleans off stubborn cement film, mortar residues & white salt deposits (efflorescence) from ceramic & porcelain tiles, flagstones, terracotta, quarry tiles, Victorian tiles, brick, concrete & any other non-calcareous natural stone such as Norwegian Slate & some types of Granite. HG cement, mortar & efflorescence remover (HG product 12) removes stubborn cement & mortar residues from all types of porous & non-porous tiles, flagstones & non-calciferous natural stone types such as Norwegian slate, granite & quartzite. Dissolve half a litre in 5 litres of water. First wet the surface with clean water & then apply the solution using a floor cloth or mop. Then scrub the surface well with a stiff broom or scrubbing brush. Leave to penetrate for a few minutes & then scrub again. Then remove the solution from the surface with a mop, & mop the floor using clean water.