I recently acquired a vintage Aerolux bulb that has a large black spot on the inside of the glass. I know nothing about glass work or bulbs, but if anyone is capable of cleaning or replacing the glass, I would be very grateful.

I recently acquired a vintage Aerolux bulb that has a large black spot on the inside of the glass. I know nothing about glass work or bulbs, but if anyone is capable of cleaning or replacing the glass, I would be very grateful.