Parts Washers and Parts Cleaning Fluids Parts washing is basic to manufacturing and service operations. Graymills has a wide range of parts washing equipment and parts washing fluids – solvent (mineral spirits), water base (aqueous), ultra-sonic, and bio-remediation. Parts washer sizes range from table top to large automated agitating machines to conveyor systems. Cleaning methods include hand, spray, high pressure spray, immersion, and agitation (mechanical, pump, and ultrasonic cavitation). With Graymills, you are not limited to a one-type-fits-all system to solve your parts washing and parts cleaning requirements. With Graymills, you can match the machine and the fluid to your specific need.