My window cleaner came in his lovely clean and shiny van today - yippee, I can see through my windows again now the winter grime has been washed off! I only get them cleaned once a year, Greg does a very good job, it took him and his assistant four hours... they do inside and out and take down all the screens and hose them down outside, leave them to dry, then replace them. I do the windows I need to do and can reach, throughout the year myself in case you are wondering.... ;)