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Originally Posted by AutoCadillac And that is where you lost me! 
See, I'd like to believe the reason I get spots when the rain come from the north is that it is a more industrial part of the country. If that isn't true, then  I'm just too old to learn new  |
It could be that the condensation nuclei from the north are dark pollution particles, while the southern air masses bring more dust. Darker particles may lead to more visible spots.