try a little turpentine, or mineral spirits and use a microfiber cloth. I used one of those cleaners on my high speed beacon lens to remove some black over spray and it worked really well. Then I just waxed the beacon lens.
Try an inconspicuous spot first.

Vandal remover may work as well.
Go to Walmart. It's in the paint section. It's orange in color.

check the ebay listings, thought I saw a couple on there. One may have been in the completed listings that didn't sell, you could e-mail the seller and see if they still have it....

Except the bottom where it sits in the tract that should buff out pretty well, if it does not have any deep scratches.
Wet sand it with some 2000 or 3000 paper then buff it with some white polishing compound.
If your not comfortable doing that remove the glass from the display unit and send it down to me and I'll buff it for ya.

Brian

Agreed, the logical next step is to try and buff it out with a DA or random orbit polisher.

If you aren't experienced with using these, send it to someone who is. You can make it look much worse very quickly