Here is another robot that can get rid of dust and dirt on your floor without you having to break a sweat. The iRobot Braava jet 250 has a compact design and uses iAdapt 2.0 navigation system to get the job done efficiently. The robot has dry and wet/damp mopping modes.
This mop can cover areas up to 25m2. It runs for an hour on battery. You can control it from your smartphone. More info is available here.