Quote:
Originally Posted by stugray
It's the only way to be sure.
Seriously I think this happens when condensation collects dust then as the water evaporates, it leaves those marks.
That is likely a horizontal surface and car experiences extreme ambient temp & humidity changes? (like driving up/down mountains?)
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I would be inclined to say it is more likely a static charge in the plastic that attracts the dust into those patterns. The charge radiates out from imperfections causing the "legs". Just seems too small and the pattern is too reoccurring for condensation.