Washing windows with a pressure washer can work. You will need to do some of the folowing things, to make it work.
1. You will need to brush or scrub them in some way. Soap alone will probably not do it, unless they are washed VERY frequently.
2. You will need to use either DI or RO water for rinse. DI is a higher quality water, and a little more expensive. There are places that ship to Tucson from Phoenix, but, the water places are always leery of renting their tanks to Pressure washing contractors, because so many go out of business so quickly, and the tanks disappear.
3. A rinse aid, in Arizona, will not work. Our water is way too hard for any rinse aid, for the clarity that you will need, or want.