22 OZ, Sakrete Concrete/Mortar Dissolver, Is A Safe Environmentally Friendly Liquid Alternative To Aggressive Acid Concrete Removers, Can Be Used To Remove Dried On Cement, Concrete, Mortar, Or Stucco From Most Surfaces, Will Not Harm Or Fade Most Surfaces, Use As A Spray Or Soak Tools, Works In 15 Minutes, 100% Biodegradable, Non-Hazardous Formula, Contains No Acids, Will Not Harm Wood, Plastic, Metal Or Paint, Clean Up Cured Concrete & Masonry Residue On Siding, Foundations, Patios, Wooden Decks, Etc, Deactivates & Cleans Up With Water, Spray Bottle.