I have a Trek 820 that I ride fairly often. I'm trying to get back in the habit, and discovered the chain had a couple of rust spots from sitting in a shed for a few weeks. There is no bike shop in town, and Google doesn't offer much specific help for these questions: 1) What cleaner do I use for cleaning the chain? 2) What type of oil/lube can I use if my only source is Wal-Mart or a auto parts store? Thanks in advance.