This is my first post here, although I've been lurking for quite awhile. I have sort of a general question, but the question came up as I was cleaning a Remington 700 BDL, so I thought this was an appropriate place to post. I recently came into a number of guns that belonged to my dad. He always took reasonably good care of his guns, but as he got up in years, I think they began to suffer from neglect. Basically, the guns sat around in zippered carrying cases. They didn't get used much. Well, as I begin to get them out and clean them up, I'm noticing that I seem to be getting what looks like rust off the exterior surfaces of the barrels. Generally, I'll spray the barrel/receiver, etc down with Break-Free CLP and let it soak for a few hours and then wipe it down with a clean cloth. On this 700 I'm working on, no matter how many times I go over it, I'm still picking up what looks like rust on the cloth. The thing is, I can't SEE any rust. The surfaces look fine and feel nice and smooth to the touch. So, is this actually rust I'm seeing? Is this something I should be worried about? How do I get rid of it?