Thanks, 'boss!
I remember reading (years back) that they did a pretty good job with metallic deposits, but were not very effective on non-metallics (like powder fouling).
John
Absolutely right! It's an electrolysis (might be the wrong word) system that is designed to attract the metal (copper or lead, there were two different solutions) from the barrel to the rod of the unit. There's no metal in powder fouling.