STONETECH^® Restore™ Acidic Cleaner is a 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. s.