From my personal experience : NO.

I bought some cerium oxide and have polished the pitted one I have at least 8 times, still pitted, although a LOT better than it was.
I don't think you will ever reach crystal clarity.

Mine started out where you couldn't even see the bulb and reflector, now you can but the major pits are still there.
I'd say you'd have to take 2-3 thousands off the surface, and that's not gonna happen unless you take it to a professional glass/mirror polisher ( if such a thing exists ).