Okay....
Out of 15 posts, TWO people mentioned using something that cuts copper.
Copper is what causes the green crap.
Most of you guys who use #9 or CLP are going to shoot your rifles a while, and then the accuracy is going to go south.
Darn, you done shot out that barrel, huh?
Sheesh.
Keep the copper under control, and you keep your fliers under control. Which requires a fairly aggressive copper solvent. But hey, that break-free stuff sure is tacticool, ain't it?
(shotgunners, for plastic and carbon, Ed's Red is about the best there is - does squat for copper tho...)
edit: Okay - two people, and one guy who seems to think that the US Army actually knows how to clean guns...