For the Future.....after you have gotten your scratchs out, each time you clean your windshield (general cleaning & washing too), clean your wiper blade edges. Many of the new good replacement blades come with a cleaner pad to take the oils off the blade when you install it. Basically an alcohol pad. You can use alcohol on a clean rag or paper towel to get the grime off or when washing the car your soapy cleaning mitt. I need to look around for a better blade cleaner. Since I replace my blades yearly, I have not run into problems with alcohol.
Also, if your windshied is dirty, your headlights are just as dirty and more. I use Plexus on the outside glass and Invisible Glass on the inside (Plexus can be used inside as well, just a little more effort needed). Rain-X will over time fog your headlight covers. Ok on Glass, but NOT on plastic. I have had it de-laminate my motorcycle fairing shield and helmet shields. I use only Plexus on them and now my cars. There are other good cleaners out there as well. To each our own.
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