Media Blasting is the most up to date restoration process. Media Blasting http://www.shelbymustang.com/media_blasting.shtml
Media Blasting is excellent. But remember Kids, you do not want to try this at Home!! Serious Metal warping can occur as the metal heats up quickly from the friction. Research any Facility you are considering before you turn your precious Metal over to any shop. They should have pictures and be able to explain the process in detail. If not or if they act "Too Busy", Find another place to review.