So wondering if anyone knows how I can get rid of this. Basically its the marking from the port when the car was delivered the number is almost stained in the glass and will only show up either when its humid or when it rains. I attached a picture but it is hard to see.

 

Little glass polish and some elbow grease should do the trick. You can also use a clay bar and some quick detail spray before polishing, just to be sure. Personally, I used an orbital buffer, but by hand should be fine also. Here's what I use:

 

Hi,
Use baking soda. It will remove some scratches from glass etching designs.



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