PROSOCO Sure Klean Limestone Restorer

A concentrated acidic cleaner for unpolished limestone, concrete and cast stone surfaces.  Safely removes atmospheric dirt, mildew and many other surface stains without risk of bleaching or discoloration.  Ideal for lightly to moderately soiled surfaces.Limestone Restorer is safer and easier to use than conventional acidic or abrasive cleaning systems.  Contains no hydrofluoric acid.  Use in combination with pressure water rinsing.