Try cleaning the rear drain hoses under the flaps for the hood, they block up and don’t let the water drain away. You should see the water run out under the car. They are quite difficult to get too, but once clear it should help, if not solve the issue. I have the same issue on my TT cleared the drains which has helped and now the drivers side is dry but still having issue with passenger side even though drain is clear. Not sure what try next. Any further remedies or issues would be greatly appreciated
