A two-step system for restoring used automotive engines involves first baking the metal parts to remove volatile oils and grease. In the second step, the parts are sprayed with a high velocity stream of aluminum shot. The aluminum shot system produces no hazardous wastes. The aluminum dust by-product can be recycled. Process greatly enhances the work environment by eliminating exposure to caustic substances.
Environmental health is improved because hazardous wastes previously buried are no longer generated.