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Wal-Mart's Robot Shopping Carts Are Coming For Us All The SmartScrub feature that tells the robot to wiggle its butt to scrub your floors works surprisingly well, but the mopping pad is too small to clean your floors effectively, and you still have to clean the mop manually. Most every other robot with a mop and dock will wash and dry it for you. If you’re not interested in mopping, the j7 is still a great robot (see below for more).