This novel tool invention enables thoroughly and quickly water spray cleaning a walk behind rotary lawn mower deck cavity. The deck lip is held in a canted position by a hook which, in turn, is attached at the top of a vertical deck support arm or stem. On the bottom of the arm or stem is attached a horizontal seating step or cross stroke with two prongs on the underside for anchoring the tool in the ground. In enablement and best mode employment, the tool is placed at the side of the lawn mower and the two prongs are anchored in the ground by pressing down on the horizontal seating step or cross stroke. Next the lawn mower is lifted by the deck edge or lip and is seated on the hook. The deck cavity is now exposed for spray cleaning with a water hose and nozzle attachment.
