Total Etch & Clean is a safe, biodegradable alternative for muriatic acid used to etch and clean concrete, plaster, brick pavers, natural stones, and travertine surfaces being recoated. Total Etch & Clean will safely remove lime, algae, scale, and excess mortar. Total Etch & Clean will improve the surface profile/roughness that will aid in adhesion of cementitious overlays, sealers, paints, and stains, along with impregnators.