The water dries on it's own. You have at least four drain lines that could potentially end up leaking into the trunk area. Two on the rear corners of the sunroof that flow down the C-pillars, one in the middle-rear of the sunroof, and one from your antenna motor that flows down behind the left rear tire. To get to the ones attached to the sunroof, you will have to remove your headliner, which is a PITA!! It's easy, but time-consuming.