Another thing that I think works good on a windshild that starts to have some time on it exposed to road debris......... I will use my Porter Cable and Pinnicle XMT finish polish #1 on the windshild, removes mild imperfections, makes it smooth as glass
and preps it for the Rainex. Even with no Rainex, or for those of you that prefer wax, really makes it smooth and the blades glide.
John