Formulated to remove dirt, grime, oil, grease, mildew stains, and algae stains for concrete and masonry surfaces. Concrete cleaner in nonflammable, fast acting, easy-to-use and 100% biodegradable, Makes 4 gallon for general cleaning, use full strength for heavy-duty cleaning. For use on concrete, brick, and masonry. Clean up with water. Gallon size.