I remember years ago Andy Rooney gave these people some grief about the product not working. I was very surprised by that at the time, because I had used it for quite awhile with good results. You do need to make sure the windows are clean before applying, and it does take two applications, each time, to work properly; and it lasts for about 6 months here in Florida; and our cars aren't garaged. Instead of sheeting, which is hard to see through, the rain or dew beads up, and when the beads collide with each other they combine until they are big enough for gravity to move them off the glass. Even when the beads are still on the glass, they are easy to see through. When the car begins to move, wind and vibration push the beads together and the windows eventually become mostly free of the water. Areas that don't get any wind movement may remain beaded, but still you can see through those areas. I DO NOT however recommend it for your front windows, as the wipers then tend to skip and behave annoyingly. I DO NOT recommend their windshield wiper fluid for this same reason, it also makes the wipers skip. I have recommended this product to many people and all have indicated their satisfaction. I did find that the spray on version of this was NOT very good however and went back to this concentrated form.