HG natural stone cement & lime film remover (HG product 31) is non-acidic and therefore safely removes cement and/or limescale residues from marble and other types of natural stone such as travertine, bluestone, etc. but is also extremely suitable for concrete and synthetic tiles with pieces of stone incorporated, such as granite and marble composite. Dissolve half a litre in half a bucket (5 litres) of water. First wet the surface with clean water and then apply the solution using a floor cloth or mop. Do not treat more than 10 to 15 m2 at once. Then scrub the surface well with a scrubbing (brush), leave to penetrate for 5 minutes and then scrub well again. Then remove the solution from the surface with a mop, and mop the floor using clean water.