Yes, if the water pressure is not set correctly, the pressure of the water could damage the windows. In order to remove stains while avoiding using high pressure, Space Clean professionally cleans your windows in stages, first applying our window cleaning formula with a wet mop to agitate dirt and then moving on to scrapping off debris with a professional handheld razor. Taking these necessary steps ahead of time allows to us to clean your windows without using any high pressure methods. For more information on window cleaning, see our FAQs on Window Cleaning.