A cleanout mechanism is disclosed for a grass discharge and collection chute on a mower. The cleanout mechanism includes a door pivotable downwardly from the chute to provide an opening in a bottom surface of the chute, and a wiper pivotable rearwardly along the bottom surface of the chute toward a position adjacent the opening. An operator control is connected through linkages to the door and the wiper to pivot both of the door and the wiper while permitting continued operation of the mower.