How to remove surface rust from gauge face?

Good evening guys,

I am working on my 1967 XR7 gauge cluster (replacing the 2-wire tachometer with a 3-wire), and while I have it apart, I would like to get this surface rust off the gauge face. Any tips for how to clean it off without messing up the paint?

Thank you for any help!

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..but, it took almost 60 years to get it to look like that…