Tell me what you use, and tell me if you know of methods not found in a off the shelf bottle.
Firstly I would have thought a brass brush and you good to go after a few strokes, but it seems not to be that simple. The second thought that comes to mind is Disk Brake Cleaning agents and/or something like Acetone used with a brass brush?
Obviously this simple methods are not the answer, so what is it that can be used to clean shottie barrels?.
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