So, Thorroclean contains Iosso bore paste? The Iosso contains an abrasive that barrel makers will void any warranty over. The unfortunate thing is that every chemical that I have tried that really works on carbon will contain some kind of abrasive. The only other things I have found that even come remotely close to removing carbon are the automotive products, but plenty of elbow grease required.There is a new bore cleaner called "ThorroClean" sold by Bullet Central. It is a mixture of Iosso bore-paste and some solution that makes it the consistency of paint. I clean my bore with BoreTech Eliminator to get the "loose" carbon out. Then I take my usual bronze brush, dip it in the ThorroClean and scrub the bore down thoroughly. I then use the ThorroClean on patches and do some patch work. Completely flush out the ThorroClean (which is not an easy task) and your bore will be as close to REALLY, REALLY clean as you can get. The bronze brush gets down in the "corners" of my 4 groove conventional style rifling and scrubs out the hard carbon. The patches make quick work of the lands. The barrel is as clean as it will ever come. After a 2 day F-Open event, the ThorroClean is quick as can be expected after a grueling 2 days..