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Both hold to the glass, mist it with ultrasonic spray and wipe automatically. The HOBOT-2S adds a second nozzle, sensors that find the edge of frameless glass, better corner coverage and an app.

Yes. A window cleaning robot holds to the glass by suction, wipes in a planned pattern and saves the ladder work. Here is what it does well, where it leaves a little for you, and how the safety systems work.