Brownell’s ‘Double Tuff’ brushes on a short rod with a drill motor.

As they wear, use them for smaller gauges.

Expensive, but a serious time saver.

You gonna mess around, or you gonna clean forcing cones?

BTW I find exotic chemicals are not necessary or desirable. A tight bronze brush takes care of the problem without, for instance, acetone. I just use kerosene.

"The price of good shotgunnery is constant practice" - Fred Kimble