After the eighth month of ownership, the black plastics on the rear hatch look as if they have been on the car for decades. My little smart was bought knowing it would be kept outside. I know UV rays aren't kind, but these plastics look bad: cloudy, off-color, and now faded. I have used...

Since scratches in plastic are often deep enough that sanding tends to produce "wells" in the plastic panels (that would need to be filled in with the appropriate plastic filler) are there alternatives? I was thinking an appropriate heat gun could probably make the plastic more able to flow...