WHich Chemical can be used for Stripping the Radiator for paint

A 69 A body 22" with HD cooling. Nice piece. I need to look for a 944 or 945.
Looks like the oven cleaner worked pretty good. I had some leaks to fix and the shop asked me if I wanted it painted. I said no. I Scotchbrited the tanks and brackets and used John Deere semi gloss black. That stuff comes out of the can in such a fine mist. It worked well. tmm