Some times is not grime that causes the interior pane of the window to appear this way .... but the cleaners applied to clean them breaks down the polymers and give the opaque or mottled look. And if you notice in the middle of photo there is a small hole that allows for pressure equalization between the inner pane and the outer pane which is exposed to exterior of the aircraft, lots of time dust and debris finds it`s way through this hole and for photo-ops guys like us we will have to wait to next heavy check or next opportunity for sidewall removal and cleaning to get good pics!
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