Hey Joe ~
Yeah, great site there that kmack mentions.
On the outside, I'm not a real stickler of making something "pristine," but I do try to get the gunk off. I use a window cleaner usually. It will cut most gunky grease substances and evaporate before running/seaping somewhere I don't want it to go. Generally I apply with a cotton patch [used for cleaning guns, purchased at WalMart] or in places maybe a Q-tip.
I use the same on the outside of lens barrels, dis-assembled and once the glass is away. A toothbrush is good in grooves etc. and I also have a couple of tiny brushes that came with electric razors that make good "micro-scrubbers."
Gunk removal from gears etc. inside camera body or inside lens gunk, I use Ronsonol lighter fluid on a cotton patch or Q-tip. Again, use lightly if what your cleaning isn't off the camera. The lighter fluid also evaporates rather quickly, but I dry the excess with a cotton patch/Q-tip as well.
Rule of thumb - common sense. "Go easy. They're cameras." If not disassembled, try to keep the cleaning fluids on the parts you want to clean.
Polishing compounds I'm not sure about - don't use any. But others do, so I'm sure you'll get some tips there too.
Enjoy the 4a!