Yesterday I was out at the range popping some caps and noticed that the melting snow had uncovered a pocket full of misc brass. So I got home and let it dry out and later was going to tumble it to clean it up. Then I thought I didn't want all this grit getting in my media and eventually going down the bore of my rifles so I dumped the corn cob out and put in a quart of hot water and a good squeeze of Dawn Ultra dish detergent. Turned it on and forgot about it. A couple hours later I decided it was time to have a look. To my surprise it was very clean inside and out. It all went from badly tarnished to very little tarnish and no more carbon or gritty dirt inside. I was going to spring for a rotary tumbler, but my Hornady vibratory tumbler works pretty good too. While it would never work with the stainless pins it does work wonders on years old muddy nasty range brass before you polish it in media.