Actually, what was really surprising to me in how well it work is the Rock N Roll Gold chain lube. Put it on the chain, spin it forwards for 10 seconds, then backwards for 10 seconds and all the crud floats to the top and you wipe it off. Repeat. Works just a well or better than the chain cleaner gizmos.

I used those chain cleaners for years - what a mess. The things get just so gross and cleaning them is worse than cleaning the chain. I threw all mine out.

J.