I run two chains, both on my mountain bike and road bike. At all times, while one chain is on the bike, the second chain sits immersed in a jar of mineral spirits. I got the idea from a poster in the commuter forum, who recommended it for people short on time to do a thorough cleaning of their chains.

I can now clean my chain when I have the time. I have found that it works well for me. I have not done any scientific study of the issue, but it does seem that my chains last a little bit longer before they need replacement.

Regards,