How to remove embedded haze from headlamp?

[IceQube]

I've attacked this headlamp with 4 headlamp restoration kits: 3M Heavy Duty, Meguiar's Heavy Duty, Turtle Wax, and Sylvania. Two of these kits required a drill. I've used 400 grit, 500 grit, 800 grit, all sorts of sandpaper, polishing compounds, clarifying compounds, etc. I cannot for the life of me get this "stain" out the headlamp, which resulted from me spraying 303 on the headlamp.

I want to get it out so I can sell the headlamp on eBay and be able to sleep at night. I don't want to send anyone a headlamp in this conditions. Thanks.