Substance on rear door window (4 Viewers)

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Joined
Oct 26, 2010
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Anyone get this. I've cleaned it off several times but still gets on there again. Worse in hot weather. It's on the inside of the glass passenger rear door

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odd. is it always in the same pattern? always on just the inside? do you have kids or a dog?
Always on inside. In the same general area. Yes kid and dog but they weren't in the car since I cleaned the window 2 days ago. It starts from inner belt area not from roof area
 
total guess but perhaps it's some sort of over-applied adhesive in the door gasket or liner that's melting with the heat? is it greasy (like the silicon grease on the sunroof tracks) or like water stain?
i don't recall ever seeing anyone post a similar issue but i've only been reading mud for 10 years or so.
 

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