Yesterday I applied Rain X to both the front and back windshields. Today, for a family visit I drove about 175 miles in the rain, sleet, hail, and snow. Glad to get back home safely. Rain X worked pretty good overall. Interesting how the water would run across the windshield to the edge as seen by the dried dirt. I drove in the slow lane the entire time around 55-60 mph so maybe not fast enough to push the water straight over the glass.