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i had this phenomenon on my previous acura. its from condensation sitting after using the AC compressor when you turn the car off. I had read if you turn the ac off and blast the fan on high before you shut the car off, it could help reduce the moisture collected in those tubes that supply the vents. also similar to the idea of the triplet FAN above, they have stuff at autostores you spray in the spots he indicated that help reduce or remove the mildew.
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