I like 'em clean too. I use a paste type cleaner - you can't believe how much junk comes out. If you think there are tool marks or if it's a cheap barrel, use JB Bore Bright, an ultra-fine polish. It leaves them like a mirror and you get more accuracy, more velocity and they clean up much easier. Polish scares some people, but you know, they lap the daylights out of them at the factory, and the more expensive barrels get more attention.