I CANNOT KEEP THE WINDSHIELD ON MY NEW 2008 IMPREZA FOG FREE. THE DEALER NOTICED A "FILM" ON IT AND CLEANED IT. THE FOGGING RETURNED AFTER A DAY. I'VE USED ANITIFOGGING SOLUTION THAT LASTS ABOUT 3 DAYS AND THE "FILM" AND FOGGING RETURNS. THIS CAN BE VERY DANGEROUS AFTER DARK SINCE WHEN THE FOGGING IS MOST PRONOUNCED. THERE MUST BE SOMETHING INSIDE THE CAR (POSSIBLY A SILICONE SPRAY) THAT'S CAUSING THIS. WHATEVER IT IS, IT HINDERS THE DRIVERS VISION AND IS DANGEROUS. *TR