DRYLOK® Concrete and Masonry Liquid Etch & Cleaner GL is highly effective in etching masonry, stone, tile, and brick. It removes unsightly efflorescence (salt deposits) as well as excess mortar. Use DRYLOK® Concrete and Masonry Liquid Etch & Cleaner, as a safer alternative to muriatic acid, to treat smooth concrete and condition galvanized surfaces prior to painting.