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Defective Window Coating ?

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I do not have any pictures , but I have seen several Low E windows that have grey/ black dots and streaking between the panes . It appears that the low e coating has become visible . I searched on this topic , but didn't find much . Have any others noticed this , and any ideas as to the cause ?

Another thing to write up I guess !

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There's basically two types of low e coatings; a hard coat that is embedded in the glass, and a soft coat that is molecule thick layers applied on the surface of the glass. Soft coat low e is fragile, and when moisture enters the airspace the metals corrode creating spots and streaks that at first glance look almost like mildew.

It's broken and needs to be replaced.

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