I got caught in a downpour today with my shiny like-new D7. As I was in the process of wiping everything down I looked with my flashlight in the main tube, and under where the water bottle mounts (w/plugs inserted) there is a nasty patch of rust. Also, after wiping around the bottom of the headset there was rust colored grease on the rag! I don't ride this bike in the rain, but it looks like the previous owner has (he claims to have only ridden about 15 miles, but maybe he left it out a time or two?). I plan on upgrading this bike and owning it for a very long time, so I'm quite unhappy to see this. Any advise on servicing the headset and removing/preventing the rust from spreading in the frame?