I have a problem with the windows on my Is250. There seems to be some weird stains which look like water streaks running down the glass. I have tried to use Invisible Glass on it as well as some vinegar, lemon juice and have even tried to scrape it off with a new razor blade but nothing helps. I know its on the outside because if i run my hand on the glass i can feel like there is something there. When i bought the car i figured it was just dirty but now i realize its something more than that. I know it can be cleaned because the windshield and the back window have been cleaned and under the windshield wipers you can see a bit of the same water spots/streaks as the side windows but i just dont know how to.
The paint is all good so if anything was spilled on it, they cleaned it up or removed it on the entire car but the 4 side windows. Anyone have any ideas?

 

Try some #0000 steel wool with some polish on a pad and some vinegar.