For light surface rust on chrome, metal (except for plain aluminum) and even chromed plastic, I've always used 0000 steel wool and a good chrome polish.
Always keep the steel wool wet with polish, and replace it very often. Use circular motions whenever you can, using just enough pressure to remove the light rust. Better to do it twice and get the result you want, then try once with too much elbow grease.
Over the years, this method has worked on a bunch of old barn bikes, on everything from spokes and wheels to forks, handlebars and even chromed plastic side covers. I've also used it on turn signal lenses or anywhere I wanted to clean the surface, before applying a nice protective wax (on appropriate surfaces) or just a good layer of Bike Spirits.