The windscreen on my car has something on it that I can't get rid of - when its raining the wipers smear the screen making it very difficult see and at night in rain its virtually impossible to see through the screen with oncoming vehicles approaching. I have tried everything to clear the screen - using Autoglym glass polish and Halfords own brand glass cutting stuff but its still a problem. I have put new Bosch wiper blades on. When the screen is dry it is crystal clean but as soon as it rains it smears again.
Can anyone recommend anything that will help - I'm seriously considering replacing the screen