Stontex Cement & Grout Residue Remover is a grout residue and cement stain remover for non acid sensitive material
It is also useful for the removal of lime, calcium & efflorescence stains
Can be applied with a deck brush or sprayed on. Once applied, agitate the stain to break the bond between the residue and the stone and then wash it off
The stone should then be sealed as soon as it dries