Chrome Plated ABS polish?
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The nickle content is usually pretty low, so I wouldn't use any heavy cutting polishes. I would start with a good cleaner wax. Cleaner waxes have some abrasiveness, which should cut through the haze and leave a protective coating over it. If that doesn't work, I would step up to a clay bar. Lastly I would try either a billet or very light aluminum polish.
I'm not sure how well it will work with the automotive stuff, but I've had good luck with non-marring rubber erasers cleaning light surface rust/corrosion from firearms and pennies.
I'm not sure how well it will work with the automotive stuff, but I've had good luck with non-marring rubber erasers cleaning light surface rust/corrosion from firearms and pennies.