I recently "discovered" a great rust remover that's real gentle on non-rusty parts or parts you don't want scratched. It's a household cleaner called "Bar Keeper's Friend." It's a powder that comes in a can exactly like those Ajax scrubbing powders, except no bleach and it KILLS rust.
I have only used it in limited circumstances, so if you try it, use on an inconspicuous spot first!
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