SB 2100 ProStore Restoration Cleaner is a highly concentrated blend of acids and other beneficial additives for use in the removal of moderate to heavy exterior atmospheric soiling and most stains found on brick, sandstone, fired clay products and unpolished slate and granite. SB 2100 should not be used on marble, limestone or concrete products. When diluted with water, SB 2100 makes a highly effective, low cost cleaner for the maintenance and restoration of most exterior masonry surfaces. When properly tested a