30+ years ago we bought our daughters a tricycle. We want to restore it as best as possible. I read somewhere that regular Coca-Cola and aluminum foil is good for removing light rust. Where we run into a problem is there as a couple places where the rust has bubbled a lot. After hitting this rust with a good wire brush I want to coat it with some type of rust converter. Any suggestions for a good product? I've always gotten good responses for computers, so might as well hit the This-and-That side.