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Glass bead is an excellent media to use on cast iron or aluminum. Degreasing the parts first will help with the cleanup. If working with cast iron or steel, I have one bucket of soapy water to clean the grit off in and another bucket of really hot water ready to rinse the parts with. I make sure my air compressor is fully charged and ready as the parts will start developing surface rust as soon as they come out of the rinse water. A light blow dry and a quick spray with WD 40 will prevent this from happening. Before painting, the parts can be cleaned with brake cleaner or lacquer thinner to remove any trace of the WD or oil on the surface.