There's one, key, piece of information to keep in mind, regardless of the visible results...once you see rust, the plating has been penetrated all the way down to the base steel and it's ruined. That said, in some cases, you may be able to get a decent-looking result, if the damage isn't too far spread. Best method is a buffer wheel & a suitable compound, most guys won't have access to this...it's not cheap getting setup. Next best would be chrome polish, if you can find it in an autoparts store; be prepared to use a lot of elbow grease. The final method and it's a little on the drastic side would be using wadded aluminum foil and either paste wax or chrome polish. Aluminum is softer than chromium so you have a fighting chance of not scratching the bejeezis out of the surface. Beware, there's still scarring potential. Fine sand and rust are both harder than chrome. Wash the part thoroughly before you begin and, if using aluminum foil, try a test section first...to see if it leaves fine scratches. Best case, you'll want to work on one small area at a time, polishing the haze, along the way to check for fine scratches (a.k.a. "spider webbing"). If you see them, time to use a clean spot of the foil. Look for the wax or chrome polish to turn color...that can be an indication that you're getting more abrasion than you want.
All you're trying to do, really, is knock-off the rust, without peeling the plating. Afterward you'd best seal the metal, either by keeping it waxed, or clearcoating. Otherwise, the rust will return in no time..and the damage will progress quicker than before.