I agree. I never hold a torch to my barrels either. I have used hot and cold water to clean with and they both work great, though I would give the nod to hot water. It naturally loosens crud from anything better than cold. For an example, if you hold a dinner plate crusted with dried sauce or something equally nasty and hold it under a stream of cold water, it may take some of it off, but do the same thing under very hot water, you'll see that it loosens up a lot quicker and is washed off more thoroughly. Now, just make sure your wife doesn't catch you experimenting. She may think you're seriously thinking of doing all the dishes!
As for hot water causing "flash" rusting, I think that's a new wive's tale. If by flash rusting they mean that bare steel will start rusting in a few hours after neing wet, cold rain water will do it in minutes. I've seen musket barrels get a bright coat of orange within minutes of getting rained on. Hot water or cold, the stuff is agoin' to rust if you don't dry and oil it. I'd never even heard of flash rusting till I got on here and I've worked with steel for over 30 years. Applying heat to steel will make it sweat too, so there goes that idea. I've made perfectly dry steel sweat simply by holding the flame of an acetylene torch to it. I can't explain all the scientific reasons but I do know that acetylene is made with water and carbide. So it's either the water or just plain condensate. And condensate is most likely the reason that feller's barrel was wet after he heated it.
I wasn't gettin' on you Roundball! I was just adding more stuff to my reply so I wouldn't have to post another one! I've only got one more day to haul those rugrats on my bus and I'm full of beans! Now maybe I'll have more time to shoot! :grin: