After many years of using vibratory tumblers and a mixture of walnut or crushed corn cobs media and Car-Nu or other car waxes. I first bought a Frankfort arsenal wet tumbler and it leaked pretty badly. I sent it back and got a refund. I then bought a Thumblers Tumbler. Boy what a difference it made. A few hours in it with Dawn, car wax and SS pins and the brass comes out bright and shiny, inside and out; even the primer pocket. I use an old jerky drying unit to dry the brass. my experience anyway, james