You might also try a place that sells/repairs precision optics, such as microscopes/telescopes/high end cameras. They often repair/recoat lenses, and may know of some industry tricks or polishing compounds.
In addition to this, lapidary equipment and compounds will do the trick; they are available in various grits in paste, stick, and powder forms, in a large variety of grits. Since they are designed to cut and polish stones that are much harder than glass, there should be some that will work. Usually, such compounds are used on power tools, and the suggestion of a Dremel w/ a cloth wheel is a good start. You must be careful and go slow, though, because this generates heat, and localized heating in glass can crack it. Given the thickness of the glass in a 180 and the small size of a Dremel polishing surface, I don't think it would be a problem, but I suggest using polishing compounds that are designed to used wet and use compound and water to control heating. (Most lapiadary compounds can be used wet.) Just be prepared to clean up the mess you're gonna create by slinging wet compound everywhere off the wheel!
There are a number of sources for these supplies on the Web if you want to tackle this.
Good luck,
Glenn
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