The robot is great. Washes windows better than I do with my hands. I washed more than 20 shutters in two apartments, saved a lot of energy. On a pair of wings, at first he was stupid, lost and crawled in one place. When they traveled again on another day, he was no longer mistaken. They must have been slippery/dirty. It is very cool that there is a piping bag in which you can pour water. Lots of rags included.