Need some expert advice on how to keep your polycarbonate windshield looking like new? Kristin is going to show you what's up. Cleaning and caring for a polycarbonate windshield requires a very specific technique. Polycarbonate might be stronger than glass, but unless it’s hard coated, poly collects scratches more easily. That’s why you can’t just grab some Windex and bunchedup paper towels and go at it all willynilly. If you want your polycarbonate windshield to stay clean and pristine, there are some “dos” and “don’ts” that you should know.