OK, so I started that thread on Bon Ami for cleaning windshields and it turned into some really interesting comments about Consumer Reports and General Motors.
But what I was really trying to do was to help a friend who had run his fairly new Honda through a car wash which had put a wax on the car. The wax wash left some on the windshield which caused streaking when the windshield wipers were used.
So the real question was, "How do we remove the wax?"
I think that finding the proper formulation of Bon Ami will work but is there a better way?
Andy