I am encountering a annoying problem with a stubborn greasy film on my windshield. I suspect it could be from a "wax as you dry" product or silicone sealant left over during the manufacturing process. I tried STONERS glass cleaner, straight alcohol, dishwashing soap and GREASED LIGHTNING, all with very limited success . My next step is lacquer thinner or a strong alkaline cleaner but I am afraid to damage any U.V. coating on the exterior of the windshield as this is a TESLA and the exterior glass may be treated to keep the vehicle interior cooler putting less demand on the A.C. systems. Put a call into TESLA Engineering and still waiting for a reply. The film attracts fog on damp Florida nights and is quite annoying. ANY SUGGESTIONS ???