cleaners

Is there a cleaning solution that can be purchased or made up at home for cleaning windows by just applying the cleaner through my pressure washer and then just wash it off with clear water,and will not streek,as I cannot squeegie.This is in an area where 2nd storey windows are above an overhang of awnings and I cant put a ladder up against it to use a squeegie and the owner just wants the windows washed with soap and sprayed clean.Right now I use liquid dish soap and water.I don't know if this will streek or not.
Thank You have a good day