I have the factory wheels on my 92 crown vic. Since i got the car about 2 years ago i have noticed my wheels changing colors. I think that they are clearcoated but I am not sure. The wheels are turning a hazy white and it looks like they have a bunch of tiny cracks in them (I'm guessing in the clear coat). I have taken my tires off and cleaned and polished the wheels really good but it is still getting worse. What can I do to fix them?