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You're not going to make them shiny again without a tumbler but the staining is nothing more than an eye sore.
I throw mine into a bowl with Dawn dishwashing soap to soak then use a baby bottle nipple brush to just swab the insides. Rinse with hot water then let 'em dry real good. I did very well without a tumbler for quite a while but eventually did buy a Frankfort Arsenal cheapy and 40lb of blasting media to keep it fed. I've found that tumbled brass that has had NuFinish added to the media helps in carbide dies, especially the 9mm that takes a little umph to de-prime and size.
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Foto Joe
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