wet seatbelt at top anchor

I am getting a wet seatbelt at the upper anchor point. Does anyone know where the water might be coming from. It is annoying, and eventually makes the belt stiff.

I haven't had that problem YET, but I would check the weatherstrip around the doors, since the plastic b pillar panel sits on the inner weatherstrip. It could be the upper door weatherstrip, but it would have to get past that, then past the inner strip. If all looks good you may have a leak around the vista window.

I have eliminated the drain from the roof (vista glass, and top door seal). I may try removing the B pillar trim, and checking behind it. The only way the water can get to the belt is via the bolt, or running down the inside of the B pillar trim.