Need to do a little research
Not knowing your situation, I can only recommend certain things that may or may not apply.
One spot that leaks that people forget about is the high mounted brake light.
But even before you check that, suppose you always park your vehicle outside with no cover. Now suppose it's not leaking but high humidity is causing your issue. Can you or did you ever park it under a cover or in a garage when it has rained but still notice the smell? See where I'm going with this?
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