It's not gonna be enough for what I suspect you have here, but light surface rust can often be removed by soaking in WD40 for about ten minutes and then rubbing with a paper towel. Repeat the process several times. The WD40 contains penetrants that will penetrate the rust and loosen it up. A paper towel is just ever so slightly abrasive and will wipe off the loosened rust without scratching even a polished surface. It's a slow process and only good for very light rust freckles, but it's also very mild and not likely to cause damage.
It's just another trick to keep in your bag.
------------------
Chuck
Balisongs -- because it don't mean a thing if it ain't got that swing!
http://www.4cs.net/~gollnick