Anyone else get a nasty weird film on the inside of their back glass on occasion? I notice that if I clean the inside with glass cleaner (never windex since my windows are tinted), after about a week of driving it, this strange oily residue and film gets caked on the it. Anyone know what it could be from or what causes it?

 

Driving with your windows open, or smoking, or using interior surface conditioners (leather, vynyl, etc). That's the crap you are breathing being deposited on the glass.

 

possibly a leaking or flooding sunroof drips water into the carpets and then evaporates, a spilled drink that evaporates, or when you use cleaning agents the evaporation condensation goes to the windows.



at least that was my scenario.