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Spotted glass defect on first clean

DeLaCruz

Active member
Messages
424
Location
Cornwall
Did a first clean on a friends place today and noticed a spotting effect on the glass I haven’t seen before - it was not anything left behind from the water, bit actually a defect with the glass. 

Itried rubbing over it with bronze wool and it didn’t come off at all. It seems like a maybe a defective protective layer that had gone bad over time - just wanted to know the science behind it so I can recognise it better and explain to customers in the future. Video of the problem attached :  


View attachment 16761


 
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