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The Car Care Products section of the Forum is the best place to ask these type questions. There have been several threads on this topic there in the past. Too several very knowledgeable people hang out there. Good luck.
I believe 303 is a big improvement over armor all, but you will still have the film on your windshield - since it can be caused by gases released from your dash even when it's not treated with surface products.
get a good glass cleaner - I just used Stoner's Invisible Glass for the first time and WOW -- it really is amazing - you CAN see a difference over other good products. you should check it out, and get
The glass master pro -- you can sit in your driver's seat and clean the entire windshield in 30 seconds. Greatest thing since the invention of breast implants.