Sure Klean® 101 Lime Solvent is a concentrated acidic cleaner for dark-colored brick and tile surfaces which are not subject to metallic oxidation. Safely removes excess mortar and construction dirt. Removes construction dirt and excess mortar with simple cold water rinse. Removes efflorescence from new brick and new stone construction. Safer than muriatic acid on colored mortar and dark-colored new masonry surfaces. Proven effective since 1954.