Cleaning your Windows at times is undervalued. When you avoid cleaning your windows or have a lawn watering system hit your Windows for years you will have irreparable damage. I cleaned a new clients windows today located on south hill in puyallup. At this point it has not been cleaned in over eleven years. Which resulted in longer on job time and also windows that looked sub-par. Not because of lack of my experience but because of lack of mainetance. Always a good idea to avoid water standing on your Windows as much as possible in Washington. Glass is some what soft and can be damaged.