[borntoshop666]

I had the same Issue with my MB Titanium Wagon a while ago. I turned out the Water Channels form the Sunroof were blocked and had come off the Connection. Once they block up, they can become dislodged and Water runs down the A and B Pillar into the Footwells. they normally run inside the A Pillar and drain out in the Wheel Well.
Interior Trim from the Pillars had to be removed and the plastic Pipes were cleaned and reconnected. Bought 1/2 Dozen of Closet Camels or Damp Rid and left them in the Car, make sure they don't tip over when u are driving. LOL
I put a Fan Heater in the Car overnite and had the Windows slightly open.
Eventually the damp Stench went away. Good Luck