If the color goes all the way through which it probably does use micro fine sandpaper such as 1500-2000 grit and wet sand with a double-density sanding block. These are rectangular shaped pads that are black(stiffer) on one side and grey(softer) on the other. They are used to sand clear coat and should be available at a body supply store. Try not to use a regular sanding block unless you are trying to remove a deep scratch and sand in a "X" pattern to avoid making lines. After wet sanding, use 3M micropolishing compound or equivilant and follow with Imperial hand glaze. Be careful polishing with a buffing machine, so you don't burn the plastic. Use a foam buffing pad not wool. You really need a machine to remove the dullness created by sanding. If you don't have one, a good choice would be the smaller porter-cable orbital polisher as it won't leave "swirl" marks.
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