cleaning my chain
i am trying to clean my chain. since i got the bike, my chain has gotten really black. whats the best way to remove this? i tried sheldon's method. i filled a smallish water bottle 3/4 full with simple green, dropped the chain in, and shook it for about 15 minutes. then i let it sit while i cleaned all the black gunk off the chainring and cog. i pulled the chain out, rinsed it off, and still found the black gunk. not as bad as before, and most of the other little bits of crud were gone, but its still on the inner crevases. is simple green not what i should be using?