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Invisible glass works great! Especially after a couple of uses. I spoke to manufacturers because i was getting streaks. They told me not to use fabric softner on the microfiber towel and they were right! By the way the film on the windshield is from the plastics and leather dyes emitting outgasses. Must be great for the lugs too.
For the hard to get spots on the inside of windshield that is angled there is that
device that Gariot's Garage has that looks triangular. The same item at Bed Bath & Beyond is called the Glass Wizard which you can purchase for less than $12.00 with coupon.