Would I be able to use WD-40 to clean the ends of my cables off?
I think contact cleaner is generally recommended, I'm not sure on a brand.
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.
try some steel wool. or scotch brite. they should clean it off well. then wipe it with a damp cloth then dry it off.