Any brass I have that is fired with black powder is wet tumbled with ss pins.
Lemi-shine is great, but it really only works because it has citric acid in it. You can get 20 pounds of this on ebay (it's used in tie-dying) for about 20 bucks, last I looked, and it's more concentrated. Lifetime supply, works better than the lemi-shine.
That plus some purple power in the big rock tumbler (or a rotary brass tumbler) for a bit, and you're good.... if you're doing a large batch, I'd suggest changing the water about an hour in.
If you don't have a rotary tumbler, you can always use a mix of soap, water, and elbow grease with a brush. They won't look great, but clean is the main thing.
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