I just noticed that on the right hand side of my 2006 Highlander that there seems to be these dark reddish brown spots etched on the outside of the glass. Initially I thought it was the dried bird droppings of a brid that feasted on berries. I tried to wipe off, but stuff will not come out. It seems stuff is stuck /etched on the glass. (Just puchased the car brand new last November 2006 from car dealer.)
What could this be? How do I get rid of it?