Fair enough, but with respect, taking up a lot of space and costing lots of money doesn't make for a cleaner barrel, either. Will putting unnecessary stuff in his caddy at home help?
Aside from metal fouling, which I agree CLP doesn't do much about, CLP and a carefully used bore snake do a fantastic job...
In my opinion.
That's the problem, right? Neither of us have any objective evidence to back up our opinions, because it's basically impossible to test. We've got anecdotes galore, I'm sure.
What I see is: I go to the range and shoot 30 rounds of hunting ammo or 250 rounds of 223 from a sporting rifle, then I wet the bore with CLP, wait 5 minutes, and boresnake twice, and the barrel is mirror bright.
I'll confess, I do have an Otis pull through that I use to wet things down with a patch of CLP before I boresnake. I recently added it to my little bag.
A dog's age (literally) ago, I put together a field kit like I described before: CLP, boresnake, rag, and it worked so well, I stopped using anything else, even at home on the bench.
For field disassembly, I always had my leatherman, so it might be worthwhile to include that.
For my non-hunting firearms, add a punch and a bronze toothbrush to my list.