The Penray 2015 Twin Pac combines 2010 Cleaner with 2011 Conditioner for heavy duty cooling system treatment. 2010 removes harmful scale and sludge deposits from the entire cooling system. It also removes corrosion deposits, green slime, and oil deposits. 2011 flushes the cooling system of loosened deposits, removes any accumulated oil, and conditions the metal surfaces. The cooling system is then ready to begin a Pencool treatment program.