Lower your top to full downward position. Then look directly behind the driver and passenger seatbelt brackets that have the little plastic covers on them (for the tonneau covers). You'll see the drip rail and the drain hole along the base of the rail where it meets what would be the back of the seatbelt area for the front seats. Simply reach in and pull out any trash and leaves that have fallen in and clogged them up. Hope this helps and my description is ok!