Long story short, this stuff impressed me a ton: KG KG-12 Big Bore Cleaning Solvent 4 oz - MidwayUSA I bought a Savage F/TR rifle, and the thing shoots pretty dang good for a factory gun, but the barrel is not pretty to look into, and fouls badly, which in turn took a while to clean up, even with Montana Xtreme, some potent stuff. To attempt to fix this, I bought some Tubbs Final Finish bullets, but needed to get the barrel perfectly clean. After 25-50 rounds it took at least an hour to clean, putting wet and dry patches through the barrel every 10 minutes or so. It had 150 through it before cleaning tonight. I slathered a patch in KG12 and ran it down my bore. Before the trip it was fluorescent yellow, and after it came out with brown on it where it touched the bore. After about 5 minutes I ran a dry patch through and it came out with a thick brown "sludge" on it, the copper! I repeated the process and got the same results, but to a much lesser degree. The third patch revealed almost nothing. I thought it had quit working, as this is a factory barrel, how could it clean in three patches? Montana Xtreme got taken out and applied heavily to a patch, and ran through the bore...usually they come out a mottled royal blue, stuff that would make 70's stoners think deeply. Shockingly to me, it came out exactly as it went in. In several years of using this stuff, I've never had a patch come out with not at least some blue on it...to put things into perspective. Thinking it was a fluke, I even let it rest for 30 minutes and patched it out-nothing. I'm sold. There's the progression, first, second, and third wet patches, with their dry brothers below them. The bottom one is a typical Montana Xtreme laden patch ran through the 308 after 25ish rounds. I'm no spokesman, just a kid about to go to college in two days, but this stuff impressed me so much I figured I'd let everyone know about it!