I think contact cleaner is generally recommended, I'm not sure on a brand.
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lol wd-40 can be used for anything i guess. you mean the cable ends? the male part? maybe you can polish it up with that. i think it's non-corrosive for the gold, but dont take my word for it.
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try some steel wool. or scotch brite. they should clean it off well. then wipe it with a damp cloth then dry it off.
The Best Floyd Rose Is A Setup Floyd Rose!

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