Art, that is basically the way I clean my muzzle loaders. If you make the water hot enough, it goes away on it's own. Just make sure you are holding the barrelled action with a rag. This is also a good way to get some of the cosmoline, grease, ???? off these mil surp rifles when they are new. But soak them down with Simple Green or something first. That sounds like it would be the way to go for corrosive ammo also. I am fairly new to the Mil Surp game, and so far I haven't had any problems with rust or corrosion, but like I said, I don't shoot a whole lot of corrosive ammo. I do shoot my Mil Surps several times a week, this is the most fun I have had in years. I love to watch the History Channel and say, "I have one of those".