I haven't found anything that cleans the initial gunk off the brass any better than the walnut with 2-3 tablespoons of paint thinner. My pistol brass gets one tumbling before seeing my dies - walnut with paint thinner. Rifle brass gets two tumblings - walnut with PT for initial cleaning, walnut with NuFinish to remove the lube after depriming/resizing. I have noticed that with the NuFinish treatment, the brass seems to retain the shine. Keep in mind that is a subjective comment, without any objective data to back it up.
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