lcgrzy

My 2008 Subaru Impreza has developed a film/residue on the inside of my windows. I mostly notice it on the front and back windows when light is shining through them. I can clean it off with windshield cleaner, but it reappears in less than a week. It didn't do this before winter came around, so this may be related to the defroster/heat. This morning, I warmed up the car (it was 0 degrees) and when I left, I noticed a smell that smelled like something burning. Is this my heater core leaking? I haven't checked my coolant levels. Do I need to have this looked at immediately? I read that coolant smells sweet and I don't think that was what I was smelling this morning. Any help would be appreciated.