Whenever I drive at nite or on rainy days, the windshield on my 98 Camry won't clear and/or stay clear. I have more luck defrosting w/the A/C that auto. goes on, but it takes a while and then it fogs up again. (I get plenty of heat and cold air coming in) I've wiped it with various different cloth/windex-type combos, but still seems like it has a film. This has continued to happen since I got new windshield (replaced due to crack). If the A/C chemicals leave film on the window, why doesn't this happen to all the cars here in SoCal? It's feeling unsafe to drive at night. Please help!