Dont think it has to do with heat i had some kind of residue noticeable on my black car. After a rain it looked like water spots only on the back said of the car bumper taillights and trunk all had it. I tried everything even claybar to clean it off nothing worked. But someone told me to use vinegar/water mixed 50:50 and wipe it off with a microfiber. Well I didn't have that on hand but I did have some Windex with Vinegar and i sprayed that on it and it wiped right off. Just like brand new again no more spots after that.
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