Don’t forget these windows need washing and polishing regularly by people dangling on ropes. I suspect it is the use of people’s rope access skills are why they do it, not the washing etc.
When I am cleaning windows

Looking and seeing all the time.
Don’t forget these windows need washing and polishing regularly by people dangling on ropes. I suspect it is the use of people’s rope access skills are why they do it, not the washing etc.