Listen I been through what you are going through and have tried about 30 different products over the last 3 years and nothing worked. Everything that has been mentioned so far I had tried and it failed. Not saying they arent good but didnt work for me. Finally I read on a Megs forum to try #4 with a polisher but all I had was the D.A. and I tried it on speed 6 and it took a little while but it worked and it worked great. This was the last resort before I was going to throw a brick through my front windshield. The side windows were worse but it cleaned them great. On top of that it left a smooth poilshed finish on it that rain just rolled right off. Try it I promise this will work.