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One trick I've used for cleaning round holes of various sorts is to saw a slot in a wooden dowel and cut a section of ScotchBrite scrubber (coarser material) or artificial steel wool (like ScotchBrite but finer, you can get it to match various steel wool grades) and chuck that up in the drill. Match the abrasive grade to the task at hand. Use oil like WD-40 or 3-in-1 for less abrasive action.
If that is too coarse then use a bit of rag like an old washcloth and rubbing or polishing compound. I've used this method to clean up things like the bores for caliper slide pins on disc brakes. I have not used it on any firearms but the principle is the same.
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