I have a window cleaner, he comes round once a month and does the downstairs and the front upstairs (so the bathroom and Jen's bedroom) but he can't get to the two back upstairs ones for the lean-to conservatory, so I do them, hanging out of the window (precariously!!) when absolutely necessary....and I'm not going to admit on here how rarely that is
Thing is - he uses a new regime of what is essentially a brush on the end of a hose pipe, so 'brushes' the windows, the water is distilled and leaves no drops/smears/marks (when he started using it I was sceptical, but it does work), so yes, he does all the conservatory and the fully glazed back door, the living room half bay, the cloakroom, the bathroom, Jen's room, the landing, and the tiny en suite, but not my room or the 'office' windows, and for this I pay him a fiver - it takes him and his firm (he has a van with the name on the side) five minutes tops to do my house.
I have thought about saving that fiver a month and doing it myself but I know I wouldn't do it, so I keep paying him.....