Jeremy

I wouldn't use paint compound.  I went to the local glass shop where he used rugh (Not sure how you spell it) and a special wheel on a drill to polish it out.  He was able to take out all the fine wiper scratches and restore the view through the glass.  Actually it was like new.  There were a few deeper scratches left, but they were almost invisible.  You had to look for them.  I later acquire a wheel and did a shield myself with similar results.