In black powder competition, we used 50: 50 Simple Green and water to clean bore fouling between events.
For final cleaning, we pump Ballistol up and down the barrel and use it to clean exterior parts. After patches come clean and all parts are cleaned with Ballistol, simply patch the barrel and exterior dry. Thats it. No water.
The guns we use this on are either "in the white" with no blueing or blued steel. Stainless steel is not used in or competition, because it wasnt invented in the Civil War. Ballistol keeps these guns rust free. Dont know how it works on centerfire guns.