It is plastic from what I can tell

My car sits on the roadside in a quiet neighbourhood when not in use, so I do not think that this has been caused by vandalism. My car is exposed to weather and the elements at all times, however.

The damage is located on the rear of the roof. My car does have a roof-rack, but I have not transported anything that would have caused this damage.

Would this be likely to come-out with a cut and polish?