When my neighbor offered me "an old road bike" I thought I'd maybe convert it into a singlespeed. It's a Nishiki sport with a nice steel frame and the more I look at it the more I want to just clean it up and ride it. It had been left out in the rain years ago and it has considerable rust on the drivetrain . What's the best way of getting it off? Is there an effective product to use or are we talking about scotch brite and elbow grease? Any insight would be appreciated, thanks.