Synthetic Detergent/0.8 oz. Oxalic Acid/8.0 oz. This is put into an automobile radiator containing 14 to 16 qt. water. The engine is run for 30 minutes. The radiator is then drained and filled with water containing, to neutralize traces of the acid Soda Ash/1 oz. Tetrasodium Polyphosphate/1 oz. Ammonium Oxalate/8.0 oz.