Frequency of chain oiling?

[flynrider]

What do you guys use to clean the chain?

Just a wipe-down with a clean rag, or use something like WD40 (I see that mentioned above)?

I use kerosene. It's a lot less expensive to give the chain a good soaking with kerosene than WD-40. I've got a chain brush, but it's really not necessary unless the chain is heavily caked with lube sludge. If you're cleaning it fairly regularly (I do it every few thousand miles), just some heavy rags will do the job.