Many years ago I remember that I cleaned old cartridges with "Sidol" an Henkel product, I suppose in the States you must have something similar (Brasso ?) its some sort of yellowish creamy liquid to rub with a cloth on the brass, let it dry for a few minutes, then clean your brass with another (clean) cloth. If in he bullets there is still the gunpowder do not use the tumble cleaner.
My 2 cents.
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"Originality can't be restored and should be at the top of any collector's priority list.
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