I have streaks on my car from the previous owner, specifically 3 of the windows. I have tried this glass abrasive that comes in a green bottle with no luck. I have also tried vinegar and polish as well. It seems etched in the window itself. When I run my finger nail through the window I can not feel it either. I just know it is on the outside because you can see it when you pour water down the window. Does anyone have any suggestions/products that I can use before taking this to a pro?