Hard to read dataplates on A/C

[Kyle Kubs]

Anyone have any tricks they use on those metal finish, self adhering data stickers that always oxidize to the point where you can't read them anymore?

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Over the years I've typically given them a good rub with my fingers and/or use my light across the plate and I can more often then not get most of what I need. Sometimes, especially when they are in a tight place my head won't fit, I take a good digital pic and I can typically enhance the hell out of the photo with photoshop to bring it up enough to see but this one is defying even that trick. It seems like the oxidation you get from aluminum or chrome. I was thinking about keeping some chrome polish or toolbox cleaner in my truck. Any other tricks from the sages?