I shoot quite a bit, and my end of the day cleaning procedure is to use a 20 guage shotgun brush (fairly tight fit) with soapy water for about a dozen strokes. Since I haven't had any long-term plastic residue related problems in any of my four in-lines, I guessthe brass brushing is getting rid of it.Don't use any solvents. Just rinse with hot water,dry the barrel, and coat with Break Free for long term storage. Seems to be working . . . .