The cowl area drains at both sides, at the side of the firewall. The front fenders cover the drain holes. If it is full of leaves or pine needles, you will probably have to dig most of the stuff out of the box until you can get to both sides. then you can use a still wire to poke open the cowl drains (they are at the rear corners). Once opened, you can flush the cowl clean with a water hose, but if its really nasty, you may have to open the drains a few times before you get it clean. Gene