[denton]

I lucked into a small ultrasonic cleaner for $5, and have been testing it on brass.

The recipe I've been using is hot water, and a squirt of Birchwood and Casey cleaner. I give the brass two 3-minute cycles, and in 6 minutes, I have clean brass.

These are 9x18 Makarov, which tends to be pretty sooty, since it is a relatively low pressure round. It pretty much removes even the soot from the inside of the case.

Here is a before and after picture.