Mildew/Wet Sock Smell after rain/car wash

[ngfilla94]

I've noticed a terrible smell the next day after driving in rain or after a car wash. It smells as though the carpet has gotten wet and developed a wet mildewy smell. It's not the A/C, because after a few dry days the smell does not appear. I've felt all around different areas on the carpet and headliner for damp areas and I have not found the source. Has anyone else experienced this and been able to locate the source?

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