Thought I'd start another rare thread by me to mark, for future reference, when I actually did clean my chain. I noticed the Trek 7200 trail bike had a grey chain the other day, quite dry, fully coated with limestone trail dust. I'm thinking may be I should clean the chain, but delayed the job for two more trips on the trail. Well today, I don't know what came over me, only have 2160 miles on the bike; but I finally cleaned the chain. I'm from the old school of cleaning greasie parts with kerosene and an engine cleaning brush. Had to break the stock Trek chain apart and replaced a fixed link with a quick link. I was out of kerosene so used some perfumed lamp oil we had in the house. Hope the bike likes lavender.
So I have some lamp oil left and I'm thinking, what the heck, the road bike chain still looks well lubed, but just may be with 3556 miles on that chain, it could use a cleaning as well. Discovered the pointy teeth on the dérailleur guide pulleys were in fact not pointy, that was all hard gunk. My rear cassette is actually chrome, not anodized black. I'm feeling a bit a shamed for putting off this maintenance for so long; but then I recall I still haven't changed the oil in the wife's car this year.