Can you buff out scratches on glass aquariums?

I know you can on acrylic, but I wasn't sure about glass. I'm pretty sure you can't but I thought someone out there would know for sure.
 
Scratches can be buffed out of glass but I have never seen a hand held method. I would never try it on an assembled tank. If it is just a piece of flat glass then there are shops that have big buffing wheels that remove scratches.
 
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