I feel obligated to point out right immediately that hand washing windows is a significantly more efficient method. Yet, why is it necessary when there is already such an assistant?! I spent a third of a day completely washing two loggias, which I had neglected to clean for the previous two years. It is preferable to remove the frames and the most of the dirt by only using a brush and a rag in conjunction with more or less clean drops of water. But, after that, operate the robot to do the final wiping and polishing; this concludes the process. It is in everyone's best interest to replace filthy napkins with clean ones as soon as possible. In front of the robot, you can sprinkle a little bit of cleaning agent, but not too much because otherwise it will slip quite a bit in the wet at first. This cleaning agent does not come with the kit. It is recommended that, depending on the severity of the stains, you run it multiple times for each window. When it comes to the final times, dry and clean wipes perform better. Be patient, I installed it, used it for a while, and then deleted it after discovering that it was a complete duplication of the remote control. It works very well when operated via the remote control. Make sure that the safety cable is hooked up, and clear some space for the electrical cords. When placed on a plastic ceiling with a smooth surface, it loses its bearings and rotates in a square pattern.