From the wide it looks already made clean, so distance of 1.5 meters. But if the entire disc is a closer look evenly full details for. Whether with water, window cleaner or detergent always remains a veil. It takes exactly 10 minutes then a window with 1m² cleaned internally. Then it takes 3 minutes for the subsequent cleaning with Fenstermopp and rubber lip again. Then the windows are clean properly. Approximately 4 minutes takes even without the preliminary work of the cleaning robot. All the commercials deceive all. The thing is louder than a vacuum cleaner and the beeping whom he's done you'll hear no more if one is 3 meters. The 6 makes window of 1m² in an hour, I can do in the same time at least 15 the then but really clean. Why caused the Schlierer is easy. The dirt remains in the mop and the water on the windshield. The rubber lip I pull down all dirty water. The disc is equal to dry. Thus, no dirt left behind. Here is no need to pull the rubber thus dries the dirty water and the dirt in the water remains on the disk. The microfiber cloths take quite a bit of dirt on but not all, are too small. If there are only small slices I take a microfiber cloth, but I sink constantly and wipe dry after so that no water remains on the disc. But all this can not be the robot. Währe been nice for window where the windowsills are cluttered desks or the front of it so that you get here is not good. One does not need to clear away everything and evacuate down again and watch where what has been. In the meantime, then clean the windows where you go. That would be ideal. Since it would have been worth it but if it is not properly cleaned afterwards has it done. 299,90 for evenly smeared window is a waste of money. In the directions is in there too you should remove the coarse dirt before use. I can then brush off right just takes a bit longer. It saves nothing. Let's see how long the refund at Paerl lasts.