There's no practical way to improve a pitted windshield (besides replacement). The best you can do is to keep it clean, but that won't help with pitting. I've seen people say you could polish out the pits, but that's never successful. I use a windshield film (similar to PPF) on my windshield on my garaged "fun" car, but that film needs to be replaced every other year on a car driven just 5K miles a year - so it would probably require a nearly-annual replacement for a daily driver seeing 10-12K miles a year. Still, it's nice when they peel off the film to replace it - only the biggest stones have pierced the windshield film enough to leave any windshield pitting behind. I've used ClearPlex and ExoShield windshield films so far, and will probably try the new Xpel film next.
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