Does anybody have any tips on restoring the appearance to the plastic inner fenders or wheel wells, there is a grey or white discoloration that has been very difficult to scrub off its almost as if its the resins coming out of the plastic, rather than mud or dirt. they are in pretty good condition otherwise, so i would like to be able to use them.
John

Try using color back polish or a light coumpound paste followed by wax usually brings faded plastic back fairly well.

I've had good luck with Cirtus Cleaner and Degreaser, made by Zep and sold at Home Depot. It made my fan shroud look like brand new. (My inner fenders are steel.)