Mr.Guido and anyone else that said to clean with hot water or just plain water will clean these barrels is right and I agree with them. Then run dry patches down and up till you see nothing on the patch. Now you have a clean dry barrel just run a good oil down the barrel. It's so easy why people want to make it so hard is beyound me I only used bore butter and never had a problem with rust in over 30 yrs. I just started using Ballistol last year and it is good stuff I just use it now. If you stop and think about it what the folks did back 200 hundred yrs ago. I just bought a second hand TC New Englander for $125.00 inside of the barrel was rusted to where I thought I was going to haft to replace it. Got to asking around how to get all that rust out and someone told me to try Evapo Rust Rust Remover.com You plug the nipple end up and pour it in the barrel up to the top Then leave it 24 hrs and pour it out and it will look black meaning it was finished eating the rust not the steel in the barrel flushed it out with hot water and run dry patches down the barrel till dry and coat with oil. Barrel will come out factory new. Buy the way this stuff cost about $30.00. So I went to Advance Auto and found a product called WD40 Specialist Rust Removal & Dissolver comes in a gallon jug and cost $30.00 works the same way as the other so I got it and did just what I said above for 24 hrs if the rust is really bad go for another 24 hrs. Lets face it if the barrel has been eaten up by the rust nothen will fix it. Most of the time it's just coated with the rust and no harm is done. If people that want to shot these old guns would learn water, scrub, oil, they wouldn't have these problems. I hope this can help someone. If not than you could say I talk to much.