clean with what brushes?

Agreed... use bronze brushes. Because Bronze is a softer metal than what lines a barrel, so it won't scratch it! There are some nylon brushes too, but they won't really clean that well.
 
I don't know if they're still available, but the blue "plastic (Nylon?)" ones sold by Midway under the "Frankford Arsenal" brand were the best I ever found. Every bit as scrubby as bronze but didn't give false positives from copper solvents.
 
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