whatever method you use to remove the rust, you should realize that you’ll end up with bare, unprotected metal that’ll start rusting the moment you’re done sanding / polishing / etc.
if you want your metal to stay rust-free you’ll need to coat it with something, be it wax, grease or paint. of course, paint is likely the best solution. use an etching primer to eat away the rust you didn’t get off in the first place.
check out this thread for more painting tips.