I have used their blueing and cleaner and was impressed with both. If the rust isn't too bad try a plastic brush or maybe brass at first with the cleaner. If I remember right I had one gun that I removed light rust on without much effort. You don't want to go too hard to start with. The cleaner worked well I thought on my double action revolver. It made cleaning it easier I thought. I wish some stores here in my area had their stuff but I have to mail order it.