Calling all parts recyclers, pick-and-pull repurposers, and lovers of all things metal! Back in MAKE Volume 17, John Todd shared a veritable catalog of ways to remove various substances, from rust to paint to petrified grease, from metal. John breaks down mechanical methods, chemical methods, and the electrolytic method, complete with a how-to for building your own electrolytic conversion tank at home. Check out the full article on Make: Projects. Dig out some old machine parts, and get your shine on!
NOTE: Not all the methods John chronicles have pictures associated with them on Make: Projects, but since the site is a wiki, you can help! If you employ any of the methods, take pics, and add them to the project. The community will thank you!