Re: I scratched my rubberised plastic covers
just spray some amourall over it and rub it. Should disappear even when the amourall wears out and the surface changes back to matt black. If you are a perfectionist, then just go to the parts department and buy a new one....the whole casing! Should not cost you more than a tank of gas.
FUture note: Do not put your cell phone on it while driving. If you have to, open the cover. On the other hand, its a good place for your mechanic to put tools, screws, nuts, bolts and what have you - while working on your car's interior! So, either cover it up before service or tell him to be careful.