Cleaned, yes. Polished, no. No Brasso either. The ammonia in it can damage the brass. Seems to me Brownell's sells a liquid you mix with water that works ok. A tumbler is less trouble though. You see used tumblers at gun shows on occasion.
A great big bag of crushed corn cobs or walnut shells can be had in most pet supply places for less than $10. It's sold as small animal bedding.
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