Many guys I know use brake cleaner since it is cheaper than some other solvents. But you need to be extremely careful. It should not be used on polymers, can damage rubber, can remove paint on sights and sometimes damages the bluing. That said, from what I have seen it seems to work pretty well provided it is non-chlorinated/non-MEP- which I don't believe is a problem with recent manufactured products.
Ditto the drill, although some gun owners feel it damages the bore and may cause excessive wear if used improperly. Part of the rub, so to speak, is the drill can potentially be used in a way which unevenly applies pressure to different parts of the bore. In theory, that creates uneven wear/potentially marking. Also, if overused it can also prematurely wear the inside of the barrel. Again, this is theoretically. I have never seen it happen.
I can't vouch for the complete brake-cleaner-drill method since I probably clean my guns the same way Teddy Roosevelt did. But it seems like if done properly and not to excess it is a relatively sound method.
If you want to be successful at anything, you'll need to develop a never quit attitude. Don't let life happen to you. Grab it by the throat and make life dance to your tune.
Ranger KW Driver