I too am baffled by the claim that the crud is at all hard to clean. I use a Brownell's chamber brush, which is a slightly oversize stainless brush for revolver cylinder chambers only. One push thru and the chamber is spotless. I have them in both .38/.357 and .44/.45. I actually carry them in my range bag and do it right at the range when I'm done shooting. It takes all of about 15 seconds to zip thru all six holes, and you're done.

They don't make them for .22 revolvers, so I just use a .243 rifle brush on the K22 chambers.