I've got a superblack 4th gen that I just had washed waxed and detailed. The annoying thing is that while the body of the car is nice and shiny, the bumpers are sort of a matte finish and dull. I'm assuming this is because they are plastic. Is there anything that can shine them up to par w/ the rest of the car? I was thinking of raiding my wife's nail buffer things, but I don't think she'd appreciate that.