Window Sucker - no more, no less

Yes, I have looked at this device with an acquaintance and even loaned me two times. I say in advance, I'm extremely picky, so I have given the product to the general public 3 stars. For me personally, the device has failed with an asterisk.

Area:
I myself live in a high-rise building, which is surrounded by a forest. Now the pollen season can basically every day to clean the window. I (to get a roll-off effect such as car polish with nano-frills to several weeks) working with various tricks, "my" Window cleaning is probably due to a relatively high level. A spot, strip or only noticeable dirt is a potential basis for adhering dirt.

For cleaning:
The device does what it should. It sucks the water / detergent from the disc. Unfortunately, cleaning the windows with the supplied sponge window is totally gaga. I distribute so the dirt evenly. Great?! So I need either every 2 window a new sponge or I clean only clean windows. Maybe it works better in the winter, as the windows are also after a few days still relatively clean.

Conclusion:
Do not get me wrong, the cleaning performance is basically about what my acquaintances understood as "clean". Here I would give 7/10 points, with 10 being perfect. Who now but less interested in the speed, convenience, or the fun factor will not come to the window polishing around. The windows remain cleaner longer significantly (similar nano-frills at car) and are spotless.