Hg cement, mortar & efflorescence remover cleans off stubborn cement film, mortar residues & white salt deposits. this is efflorescence. it is especially suitable for porous & rough textured floors & walls. Dampen the surface beforehand with water. then apply hg cement, mortar & efflorescence remover diluted with water with a scrubbing brush. Allow a few minutes for the product to work, scrub well & rinse off with water. one litre is enough for a surface area of 15 to 35 m 2. use hg porcelain cleaner on floors when cleaning for the first time to remove the very last remains of cement.