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The rear window on my '13 FRS has a lot of blotchy patches on it, too. I always chalked it up to the plastics used in the interior off-gassing and leavind deposits on that window in particular because it's more horizontal than all the other windows. Who knows, I haven't bothered to try and clean the inside window surface because I'm concerned about messing up the defogger...I drive in winter weather a LOT.
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Drive like everyone's life around you depends on it...
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