You don't want to use any polish that contains ammonia (such as Brasso), because it can cause the brass to become brittle.
(I also typically throw in a handful of small squares cut from used dryer sheets to collect some of the dust associated with tumbling.)
I'm going to try this..I always get black lung when I sift the cases out
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My latest idea is to take old towels (or buy some cheep ones from Walmart) and have the spousal-unit make them into bags with a draw string and run them through the dryer for 10-15 minutes.