From a female perspective the need of purchasing of a window cleaner is not the case with 6 windows, from a male point of view already (window 6 is a door!) But only must he try so on which surfaces of the vacuum cleaner works the purchase is worth already! How and at what angle the suction cup to put the learning curve to the technology and to use istbenötigt some applications the result is presentable and streak-free, even at mid-day sun.