STONETECHRestore Acidic Cleaner is the heavy duty, acidic cleaner that removes dirt, hard water deposits, efflorescence and rust from tile and acid resistant stone, masonry and grout. It quickly renews the surface to a like-new appearance. This no VOC, concentrated cleaner can be diluted to light, medium and heavy duty use and also cleans tough soap scum and light grout haze. Great for use in heavy traffic areas.