+1 to using Evapo-Rust. I'm in the middle of restoring our original heater motor right now, the product is simply amazing. Used it for the fan cage specifically and it came out so nice and clean, I could shoot it with clear and probably call it good. Used it over the winter for those front disc brake Kelsey Hayes/FoMoCo disc retainer plates too (and the original bolts and star washers), came out clean as a whistle, after a couple-of-day soak. Safe to handle, good on the environment, reusable....sounding like a commercial now... Good stuff though. Another opportunity to thank this Forum too, because you guys are the ones that mentioned it in the first place. Very much enjoying the restoration pictures of the Shelby too!