Whatever you try, do a small test area on the passenger side down beneath the windshield wiper.

I would NOT use an abrasive, but rather a dilute acid such as vinegar. 

Karl Wolz
Sent from my electronic umbilicus

> On Oct 27, 2014, at 8:32 AM, Dan N <dn92610@GMAIL.COM> wrote:
> 
> try Turtle Wax heavy Duty polishing compound (red label)