I heard this worked very well so I filled a small pan with enough fluid to fully submerge the very dirty barrel from my Colt Commander. I have always had a lot of problems getting all of the powder and copper residue out from around the rifling grooves on this barrel. This still held true when using Hoppes #9 and brass bore brushes. I tried the ATF route and left the barrel completely submerged for about 2 full days. I used a nylon bore brush for just a couple of strokes to remove anything that was loose and that was it. After running 3 or 4 dry patches through the barrel I have to say it did a really good job cleaning that barrel and made that bore really shine. Anyone else have any similar experiences or know if there is any reason not to do this?