I have a very difficult set on windows and welcome advice. This is part of a lucrative job so please dont say "ditch it " ! Its an old tower and the top windows are out of reach of my pole and have to been cleaned from inside. They are sash and case, with the lower half opening inwards. No problem there. The top half however have to be cleaned on the outside by leaning out with a mop on a pole and then squeegeed the same way. The results are less than satisfactory as I cant scrim in any way thats much good. These windows are 8 over 8 and 8 feet from top to bottom so there is no way I can reach out and up.
I wondered about one of those Karcher thingies but I cant see how to attach it to a pole and work the trigger. Bear in mind that I'm 60 or 70 feet up.