I finally broke down and ordered some steel pins and a tumbler today. I had some really grungy brass come to me, so I gave it to Deaner, my trusty gunner buddy. In one hour with pins, water and a bit of cleaner - presto! Just like new. Years ago, I used my dear old Thumbler's Tumbler, then advanced to a Frankfurt Arsenal shaker. Also tried citric acid. Nothing compared to the brass Deaner cleaned for me.
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