www.safestrustremover.com. Great stuff. I have been using it for years. It will remove the rust without altering the metal. I have some examples of the process in my Trans Am thread.
https://www.yenko.net/ubbthreads/ubbthrea...ogess#Post99666
Sadly, the guy that makes this stuff did not patent the process as he was afraid that people would then get the recipe and copy it. His competitors ended up doing that anyway because he didn't patent it.