Clay will be more than sufficient as a matter of fact I recommend you clay your glass as often as you clay your paint. Overspray, sap, industrial fall out, all have a tendency to bond to any exposed surface... its not like it saw one part of your car and decided to stick ONLY THERE... if its on the paint, its on the glass.
Claying will make a huge difference in clarity, it will also allow wipers to work more effectively, and makes the glass easier to clean when its nice and smooth.
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