I'm looking at case cleaning equipment. I have a very old rock tumbler that might get cleaned and used, but I've been looking at new equipment as well. Frankford arsenal makes a cheap tumbler that I could easily afford. The other thing I have looked at, is something my father was talking about the other day. Jewelry stores have ultrasonic cleaners that use a liquid suspension to clean light metals. we figured brass would be a perfect metal for one of these. These machines are dirt cheap online, and the cleaning liquid is rather inexpensive as well (denture cleaner apparently works). Anyone have any recommendations for case cleaners?