Help!!...How To Clean this Glass

Help Windex does not work...

Hi gearbow 

This issue has come up a few times in the last 12-18 months. It’s certainly worth doing a search on Wetpixel. There’s been a good deal written about this exact problem. 

Various solutions have been offered from Coke to Brasso (a British metal polish) with varying success. 
I had the problem myself on a macro port some years ago. Eventually  I got the glass changed.