If you've searched for a way to improve windshield visibility in rain, you've probably noticed there are dozens of options. Sprays, wipes, coatings, additives. Most of them do something, at least for a little while. But if you've tried a few and still find yourself squinting through a smeared windshield every time it rains at night, the issue usually isn't that you picked the wrong brand. It's that most products in this category only address part of the problem.