I have started noticing that after a car wash or rainstorm the center floor area of the back seat is saturated with water. Not around any of the edges. It starts centered behind the passenger seat and then works it way across to the center of the drivers seat.

I do not have a sunroof and the door tracks are dry.

Third brake light? Rear window? Does anyone else have this issue and solved it?

Appreciate your input.

 

FWIW, i had that issue with a 2002 Screw I owned years ago. I took clear plastic tape and completely covered the third brake light from paint to window to see if that solved the problem. No more water with the clear plastic and tape.
From what I remember, taking out and replacing the third light socket and rubber seal was a chore.