This method:
[ame="https://www.youtube.com/watch?v=UEJbKLZ7RmM"]How to Restore Headlights PERMANENTLY - YouTube[/ame]
I managed to get the wrong kind of clear coat, though. Managed to get a "crackelated" effect on the glass. Pretty clear after pic though. This is immediately after clear coat so the crackeling hadn't started yet. (before pic repeated below)