My '85 Raleigh's frame is in pretty good shape, but it does have some minor rust here and there. I don't mind the appearance of it, but obviously I'd rather it not spread.

It's worst along the top tube, especially near the brake cable guides, where the seat post inserts into the seat tube, and one one side of the rear fork.

I don't have any intention of stripping the thing down, and the paint and decals are on pretty good shape, so I don't want to sand and repaint or anything like that. Just clean up the worst of it and then try to keep it from spreading.

I'm guessing just hitting the thing with some Rust-o-leum clear-coat isn't the most advisable course of action here. Any "you probably already have all these items lying around the house" sort of de-rusting secrets that you folks could share?