This product will easily clean and brighten the dirty concrete to an amazingly white/new concrete look that you will be very happy with. Whoever said that effective concrete cleaning products had to be made from toxic phosphates, never tried our eco-safe concrete cleaner. Our concrete cleaner is made from the strongest mix of sodium percarbonate (hydrogen peroxide) that we have ever manufactured. It is a very effective "bleaching and cleaning agent" and is safe to use around the pool, along your walkways, on the basement walls and floors, on the garage floor or most commonly; to clean the Driveway. All without burning the grass, your skin, or a hole through your pants, and will not stain or discolor any other surface that it may come in contact with. Say good bye to stains from mold and mildew, and welcome a clean bright concrete look. The effectiveness of the millions of tiny bubbles that the product deploys is nothing short of amazing. They will penetrate every little crevice and Pore of the concrete surface and lift everything up to the surface for an easy cleaning that is unmatched by any concrete cleaning product, hazardous or not.