Though this tool looks suspiciously like a regular spatula repurposed for lawnmower duty, it is specifically designed to clean debris from the bottom of a mower deck.
The durable 2" wide stainless-steel blade has been taper ground along its 5 3/8" length for flexibility, allowing it to quickly conform to the underside of the deck. The blade corners have also been radiused to prevent scratching. The 5" long handle is polypropylene with a rubber over-grip.
This tool is simple yet effective (and superior to a screwdriver!) for removing caked-on grass.