On a shell like that, I usually rinse it with warm water and dawn in my hand or a soft wet paper towel. just be careful with the loose chrome coming off the the shell. It can scratch the shell when you are cleaning or polishing. Get it loose and gone first before proceeding. Also, check for a interior date ink stamp prior to nay of this. Make sure not to get it wet or wipe/erase it. Good luck!Mike
Hi Mike! Thanks for the suggestions. I ended up rinsing it off in warm water, drying it off, polishing with a layer of Mothers aluminum polish, then two layers of carnauba wax and the shell shines! I'll have to post some pictures tomorrow.
I avoided what I could of the ink date stamp inside, but a little bit of the polish wiped off the day and the year. I took a picture of the ink stamp before I cleaned it, which says May 4th, 1966, but it was REALLY faded - now only the "May" is there. That's a bit of a bummer. At least I have proof of what it was.
I'll have the drum back together soon, thanks for the help!
Luke
EDIT: the picture keeps uploading upside down, I can't fix it