Abstract: A method is disclosed for treating iron based parts. The method includes the steps of immersing the parts in an alkaline based degreasing solution and simultaneously subjecting the alkaline based degreasing solution to ultrasonic vibration. Thereafter, the parts are rinsed in the water bath and, following the water rinse, immersed in a water soluble corrosion based inhibiter. The parts are then dried and, subsequent to drying, painted to protect the parts from corrosion.