Old dogs can learn new tricks. I will be 80 my next birth day. I came up with this idea a few years ago. I am sure most of your wives use static cling sheets in the dryer. We use to just trough them away after they were used. The idea came to me, why not put a couple of them in the shell tumbler and see if they will take some of that black dust out. Well it does, it won't get it all out but it will extend the life of your media. I just put a couple of them in the tumbler (no shells) for about 15 minutes, and I do that a couple of times with clean static cling sheets after each shell cleaning sessions. It does work and has extended the life of my media.