I live on the eighth floor.. so.. you will understand why I write this story and why this idea came to my mind.

I am afraid to wash windows at a great height. But I have to do it twice a year. So, it is a big problem for me.
I suggest setting up the windscreen wipers like you have in your car. You will be able to wash your windows without opening windows. Just push the button and windscreen wipers will wash your windows very, very clean... No fear, no exercise stress....