Efflorescence forms on the surface of concrete and masonry when minerals are carried to the surface during the evaporation of moisture contained within the substrate. Lifeguard Efflorescence Remover is a heavy duty cleaner formulated to breakdown and dissolve mineral deposits that appear as a chalky white powder on the surface of architectural concrete and masonry. Lifeguard Efflorescence Remover can also be used to remove cement haze, grout residue and hard water stains.