Grandpa taught me this one for cleaning the radiators. Drain the radiator and flush with water. Pour about 8 ounces of INSTANT TEA ( No leaves or bags sugar, lemon or milk) into the radiator. Drive around for 2 or 3 days. Drain and flush with water hose. I still do my studebaker and tractor radiators this way. It leaves the radiators very clean and the overflow smells good. Jim --------------------