I use something called "miracle cloth"(sp?) (similar to "lead away"). Just cut a small strip and wrap it arround a subcaliber bore brush to make a snug fit. The cloth is chemically active so give it 5 or 10 minutes to work then clean with solvent as usual.

Also good for cleaning the front of cylinders but use cautiously on blued surfaces as it can remove the bluing if over-rubbed.

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