have you been washing your car? Possible sunroof drains are clogged. Open your sunroof and use a air compressor and blow out your drains. When you open your doors its the pinched off rubber tubes in the front of your door frame. Try that first. It coould also be collecting and running down from your window cowl @ your fresh air vent. Open that and see if its damp in there.
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06 Passat 2.0T - stock
90 GMC G1500(DaTurd) - rust bucket
02 Jetta GLX VR6 12v: - few things below
1 of those stubby things on the roof
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2.5 in borla catback w/o resonator
2 12" JL W1v2
JL A1200 Amp