My Amp Tech uses WD40 on EVERYTHING.
He scrubs amps, screws, trems with a toothbrush and WD 40 to clean and
protect it.
It certainly helped with my Laney heads that had some corrosion from
years of sitting in a garage. The damn thing looked better then new!
But I'm not sure if you would want that on your trem if your
palm muting
and stuff.
The screws wouldn't be a big deal..