Hi.
I am currently detailing a new (old) little Ludwig kit that I recently purchased and one of the toms had lug mounting screws that were completely white with oxidation. I think it is the zinc in the alloy that causes that white appearance -same white stuff that lifeguards put on their noses at the beach!x-mas1 Anyway....I always just spray all the metal parts down with a coating of good old WD40 and let them soak for several hours. I don't ever bother to scrub the oxidation off. It just soaks away for the most part. I just wipe them dry of the excess WD40.
For any pitted chrome or stamped steel parts, I use the same WD40 soak followed by a scrub with a broken-off popsicle stick...the wood of the popsicle stick is soft and won't scratch anything and the broken-off ends have litte splinter-teeth that really get into the small spaces. After I get all the pitting removed, I then follow up with some Brasso and a terrycloth rag...and then finally paper towels.
WD40 fixes almost everything!Burger Kin