I don't clean the back sides of the Lexan very often but it doesn't look that bad to me because it begins to blend in with the silver paint when its wet. However, I can't stand the brake dust buildup before I wipe the wheels down with Quick Detailer.
I can get the skirts off fast with a boxed in wrench and a screw
driver bit in the electric drill too.
Used Lowes aluminum carpet threshold to arch the skirts and stop occational slapping at highway speeds behind semis.
