PC Soap Plus is a heavy duty soap that contains a mixture of five detergents; thus maximizing the range of soils that can be effectively removed from concrete surfaces. PC Soap Plus is made up of complex sequestrants to capture and remove calcium and other hard water minerals from solution. For light soils use 3-5oz to 1 gallon of water. For heavier soils use 8-9oz. to 1 gallon of water.