I need some ideas for cleaning the windshield of my truck. While making one last trip to my old place over the weekend I filled up at a circle k and used their cleaning brush AND after trying to RE-clean it at least 5 times with several products it still has an oily smear look. Driving into the sun gets real bad! The last product I tried was Windex Foam & have tried a couple of different brand blue sprays, but so far nothing will touch what got on my glass! I'm about ready to get out the razor blades, so please help if you can, THANKS