The previous owner left scratches all up and down this section of the car (between the front and rear doors), on both sides of the car. Does anyone know how to remove these scratches? I'm not sure what kind of material it is. I am ordering a 3M scratch removal system for some light scratches in the body clearcoat. Would that also work for these scratches? The surface feels like plastic so I don't think sanding would work on it.