Regarding my C&V '85 Fuji that you've read about and/or seen photos of, I am wondering about cleaning the chain or how to properly maintain the lifespan of the old chain. I seriously doubt the chain is the original from 1985, but am just curious about taking some time to do "bicycle maintenance" today.

Yesterday after I got back from my 24.5 mile ride, I just happened to look at my chain and saw that it was a little blackish in color. Everything is fine, everything shifts fine, the old '85 Fuji is riding beautifully. But there seems to be some kind of "funk" built up on the chain and around the rear derailleur. How do I clean it up a little? I have tons of rags for when I change the oil in my Chevy Silverado or work on my Honda Shadow motorcycle.

Also, if a day came where I wanted to completely replace the chain, I notice that nobody really has regular bike chains anymore. Everything is now meant for 8, 9, or 10 speed racers. I have the common, "old school" Suntour 6 speed freewheel, and a regular multi-speed chain that was probably used on everything back in the day.

So, getting to the point...
** How to I easily clean off my chain, and with what?
** If I ever needed to replace the "old school" 6 speed chain, who still makes that style?