twice now weve put some slugs through my 14" hp9, last time it was only about 20, this time was probably close to 3 times that many, and the barrel gets filthy. i use a spray cleaner in there, scrub it and do whatever i can and i still end up running 30 patches through the bastard. yesterday after about 20 patches i just left it in a laundry tub with hot water and soap to try and break things apart. and it still took some cleaning. what are you guys using to clean your shotties with after a good day of slug use?