Until now, the only effective way to remove the mortar smear, grout residue, cement and efflorescence from brick, walls and finished concrete has been to use acids. While these acids dissolve the mortar, they pose significant dangers to other parts of the building, and to the person using the product. Envirosafe is not only the strongest masonry cleaner in the world, it is also the safest. Independent tests confirm that Envirosafe dissolves more calcium carbonate than Muriatic (hydrochloric) or phosphoric acids, the active ingredients in virtually every other masonry cleaner on the market. Envirosafe Masonry Cleaner will safely and quickly clean pavers, block, brick, concrete, river rock, architectural concrete and retainer walls while dissolving all signs of efflorescence. Plus it is color safe on even the lightest colors. Since Envirosafe is acid free, no neutralizing steps are required. This also means it will not etch glass or harm plants or turf. Simply dilute, apply, agitate and rinse.