Total Prep is a professional grade efflorescence and stain remover formulated to dissolve efflorescence and remove surface stains such as ground-in dirt, light tire marks, and iron stains. It can be used on concrete/brick pavers, natural stone, slabs, concrete retaining walls, and many other concrete surfaces. Total Prep is environmentally friendly and user friendly. It contains no hydrochloric acid. Total Prep cleans and conditions the surface evenly and enables sealers/protectors to penetrate and cover more efficiently.