lizard walnut media... Who would have though? I always learn something from this group... "PRICELESS"If you add in lizard walnut media which is super fine, the tumbler or vibrator will have really nice media fluid flow plus the fine media seems to help keep flash holes cleaner. The fine walnut has much more surface area so the cases will clean up faster too. Plus dirt cheap at pet store.
I do like the answer shoot them before they get tarnished again though!
No, that would be incredibly unwise.. I have in the past, used a case spinner (mine's a Lyman) and a drill with Brassom on a rag on some really old military surplus 30-06 years back and it took care of the discoloration and the "green contamination".
Not a good idea. If you want them to be real pretty, Krazy Kloth works great - but it's pretty tedious. I wouldn't want to do more than about fifty rounds at a time. Amazon sells it. Wipe the cases with a paper towel afterwards.