Take it off and matt black it. Best thing I ever did to my 172 grill.
Sorry but isn't that carbon fibre/lacquered? If so, polishing is required.
What about the stuff you can get to restore plastic exterior/interior trim, not the spray, the stuff you have to wipe on, I've recently got some and it does a much better job than any spray.
Although when applying it how do you avoid getting it on the body of the car I mean it smears like hell and is a nightmare to get off.
its plastic
Seriously? Blimey, thought they were CF :S