Corrosion or dirt

willie_901 said:
Many alcohols are hygroscopic. Atmospheric water dissolves in practically all alcohols. Of course rapid evaporation reduces water exposure. Careful cleaning is unlikely to accelerate thecover glass delamination. But disturbing the cover glass surface by careless cleaning could increase the rate water reaches the IR filter layer even though there is no immediate optical evidence of scratches.

The average relative humidity in Palm Springs is described as:

"The relative humidity typically ranges from 52% (mildly humid) to 83% (humid) over the course of the year, rarely dropping below 7% (very dry) and reaching as high as 100% (very humid)."

Monthly averages are here.


Water is the sole cause of M9 sensor cover glass delamination.
Click to expand...

I am not sure where I saw it, but there is a video that someone touring the Leica factory in Germany took of the lady cleaning the sensors of the cameras that is priceless. She used a Pentax gum (like a pencil with an eraser at the end) and hits that sensor like craze. She looks in acomputer maginifcation of the dust, and takes a swab, and rubs it back and forth on the sensor. Back to the Pentax tool. At the end, the sensor is clean.
 
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