Automatic sprinklers can be great for your lawn when they are properly adjusted, but can cause damage to your windows. Over time, the water that is spraying on your windows is drying and leaving hard water deposits on your window. As the months and years go by, this buildup will "fog" your windows or hardwater deposits will be very visible. The good news is it can be remedied. The deposits can be removed by specialized chemicals that are for this, also try adjusting your sprinkler head.