Never use oil or any kind of lubricant inside your barrel. Lubricant should stay between your barrel and hop up rubber, and not get inside where it will contact a BB.
Clean with a cotton patch on a regular basis. Once or twice a year you can clean it with a cotton patch and Windex, a strong solvent like acetone or alcohol is overkill unless you have glue in your barrel, and can also damage the finish on cheaper coated barrels.
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