I have finally gotten around to cleaning windows. I really don’t like that job, but Pro-Tek has made it much easier and very inexpensive. Only 1 oz of Pro-Tek in a gallon of water. Then i poured it into a spray bottle and started washing the inside windows. I don’t have hard water at my house so on the outside I used it a little stronger and just sprayed it on, scrubbed any bad spots rinsed it with the hose and used a squeegee instead of wiping it dry. Once again Pro-Tek has saved me TIME and MONEY.