How often do you clean the windows of your home. The insides of mine do not get very grimy as I have no small children and no smokers indoors. On the other hand the outsides get dirty often and prevent me from having a good view of the beautiful birds etc. I recent paid a small fortune to have replacement screens made for several of my large windows and had the insides and outsides cleaned for the first time in the three years we have lived at the farm full time. Since a couple of the windows are important to me I just purchased a large squeegee and washer thing that can go on an extended pole (windows are high on the outside), hopefully that will help.