Before going after rust with anything abrasive, I would advise trying Happich's Simichrome metal polish. It's paste in a tube, and costs $10-12 for not a lot, but it works pretty well. I can also vouch for oxalic acid as being very effective, but that's something you have to immerse parts in, and you definitely want to keep stuff that's not chrome on steel (cadmium plating, zinc plating or aluminum) out of oxalic acid. You could use oxalic acid if you're willing to tear the frame down completely (I'd do it). However, maybe your rusting isn't that bad. Folks differ about this here, but I'm one who would never use steel wool on chrome (or tinfoil, or any of the other metal-on-metal solutions).

The International is one of my favorite bikes to ride alongside, and just admire how purty it is. Maybe I'll get to ride one someday.