How to polish clear coated aluminum wheel?

I have a 20 year old F150 with factory forged aluminum wheels. The clear coat is still on the wheel -but the clear coat is cloudy. If I wet the wheels-the clear coat becomes clear again-until the wheels dry and then the cloudiness comes back. This leads me to believe that the cloudiness is on the surface of the clear coat. What polish will remove the cloudiness but not harm the clear coat?