To answer some of the questions...I got the car a couple months ago and it sat outside in Colorado for quite some time. When the glass is wiped down it feels perfectly clean in the inside and outside. I tried a paste type cleaner last night but have not tried a polishing compound...that’s next. Did try barkeepers friend...I actually used paint thinner last night...which is what you see in the picture. Soon as it dried...cloudy again. I will try polishing tomorrow and post the results.