I am a little behind on my yearly window washing routine. Now I clean my windows more than once a year but annually we go through all the windows and hose the house down and take off the screens and scrub them and then do the windows up all clean and shiny. I don't love this chore so I break it up into four days.
Each morning the girls and I do a side of the house. One daughter does the screens with Softscrub and scrub brush and one does the inside of the windows while I do the hosing down and the cleaning of the outside. For cleaning the windows the most economical way is to use vinegar and water and old towels and rags. Costs next to nothing to clean them this way. Just some time and sweat.