There is a good chance that the scratches you are seeing are actually cracks that happen when the film is failing. I just spent 6 hours trying to polish out the film on my coach. I used the same tools that I use to polish out plastic headlight lenses. Even after sanding it with 500 grit sandpaper, the scratches were still there. Then I had to sand with 600,800,1000,3000,then plastic cleaner and polish. It is nice and shiney, but the scratches remain.
1999 Beaver Patriot Thunder