rear fender flare wear

Anybody suffering from rear fender flare destruction. The low front portion of my flares on the rear are / have suffered serious deterioration and discoloring in the 11,000 miles I've had my truck. I have front mud flaps, which we all know are the best and longest in the industry. I have also installed "rocker flares" which are supposed to keep any rock or road debris from hitting that portion of the truck. My truck is black, the lower front portion of my fender flares are grey. I live and drive this truck in town on paved streets. What can I do to "reverse" or improve the look of the damage and what does everyone suggest to do to reduce further damage?

 

pics?

 

I don't have pics, but I could get them. Keep in mind, I'm anal about the care and look of my truck. So, to have to look at and see this wear just bugs the hell out of me.