I tried a window-cleaning robot and it was surprisingly impressive, especially at $200 off
After charging the robot and setting it up in the Ecovacs app, the Winbot W2 robot needed me to install one of the two included microfiber mopping pads....The Winbot W2 Omni instruction manual recommends filling the tank with a cleaner.
Window squeegees effectively clean glass surfaces, utilizing rubber blades to push dirt and water off, and the Sorbo Squeegee Set is highly recommended.