I too have been wondering if I could use my clay bar on my windshield. I noticed that my MF towel "grabs" when I run it across my windshield (after I washed and dried my car). I think I'll try using my clay bar (as recommended above) and see how much of a difference it will make.
Tom
2018 Lincoln - MKC
Midnight Sapphire Blue Metallic
Anything you can do to remove contaminants and smooth the surface will help a windshield. I've used clay, #0000 steel wool or even a strong polishing compound. You'll never smooth out nicks or scratches without a glass-specific product, but removing any garbage bonded to the glass will always make the glass seem smoother and cleaner. Wipers work better and rain sheds easier.
I'm lock step with Bobby's recommendation. I love both the glass restorer and the Meguiar's Glass Cleaner. I've used many glass cleaners and it's hard to beat Meguiar's for the price OR the performance.
Also, after claying the windshield, wax it. I'd use a sealant that lasts quite a while (I usually use DP PolyCoat or UPGP).
It makes a HUGE difference in the rain and also when washing. You'll find that you barely need to use your wipers and drying/avoiding water spots/etching will be easy.
Glass is no different from paint. Clean, polish if it needs it, and then protect
2009 Summit White Cobalt SS/TC SOLD
2007 Black Cobalt LT - Daily Driver
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