Saw a pop-up on a work-related forum I visit and just couldn't resist looking. A new toy for ONLY $130, although you can get 20% off and free shipping for Halloween. Grill Cleaning Made Easy | Grillbots | Grillbots
They do make a robot that washes floors, it's from the makers of Roomba, called the Scooba. There's also a robot that cleans gutters.
I'd rather clean the grill than vacuum or wash the floors, or clean gutters...