Take a piece of aluminum kitchen foil and screw it into a ball. 
Soak the ball of foil in clean water.
Put on a pair of rubber gloves to stop your hands getting stained
Scrub the rusty leg with the foil and watch with amazement as the rust dissolves! Re-dip the foil ball in water as needed and replace when necessary.

Does this method only work on chromed items or will it work on other metal or plated surfaces?