I've used hot water a lot, but most of my hunting is away from home, and getting hot water is and a bucket and all has been harder to deal with, so I was always looking for a safe way to clean my guns. It was, in fact, old military guys told me about alcohol and the secret of using a brush.. so that's what I do when I'm not at home.
I still use hot water when I'm at home sometimes, but alcohol and murphys with a brush and lots of TIGHT PATCHES.
Aloha..