Briefly back to the Shimano RD clutch topic: shifting was meh today so I thought I'd take a look. It was... Ugly. This bike has 1100mi on it, new in April. I've only ever washed it with a hose, and it rarely rains here.
Being curious, I took it all the way apart, exposing the sprag internals for your edification. I managed to clean but not lose any of the tiny roller bearings. If you go that route, it appears that the main cylinder is directional (i.e. it only goes onto the inner hub part one way). The Shimano manual says not to grease the inside, but I found reference to the use of light oil there so I added a few drops.
Reassembly was easy, and the blob of grease I obtained from my LBS should last several more services.
In other news, the chain still hasn't reached .5 on the checker, so I'm impressed by its durability. The Rock n Roll blue I've been using must be ok, even though it pretty much falls off after 20 mi. I've been carrying a tiny bottle and reapplying on longer rides. After this der service and a good cleaning, I've switched to EP Ultra, which has been really good on my road bikes. Maybe it will last longer, or maybe it will just get filthy.
ride bikes, climb, ski, travel, cook, work to fund former, repeat.
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