Outers Foul Out Roy. I can't post links but Midway carried them. Looked it up and Midway says they are discontinued, evidently they didn't sell well in Idaho
I'll probably botch this explanation, but here goes: The kit consist of bore/chamber plugs, a metal rod, o-rings to keep the rod centered in the bore, an ac adapter, and solutions for lead or copper.
Plug the bore, fill bore with solution, place rod in bore, attach power to the rod, and wait.
It pulls the copper fouling to the rod, wipe the rod clean and repeat if needed.