I use wipeout (great product). When I do it, I roll up a sheet of paper towel and plug the chamber end up, spray the foam through the muzzle, and put a foam ear plug in to cap off that end. Works great for me and don't see a need to spend more money for that. As for filling a solvent in, you could and like it is already posted, go through alot of solvent filling the barrel. You probably won't be able to reuse it if it's to dirty. Give wipeout a try. I was skeptical at first, saw a can at the gun show and bought. Cleaned my barrel out real good like I normally do, put the wipeout in, let it sit for 3-4 hours, ran a patch through and I still had copper in there even though my patches came out clean with my copper solvent.