I'm currently using STP Visionblade, aka Aquapel. It's just Aquapel under the STP label. Only now is it showing signs of quitting, after 7 months!!!:bow
Here in Seattle, with the TON of rain we get, I say I'm pretty impressed. It beads and rolls off better than Rain-X. It is pricey($10.99 for one application), but it goes on and buffs way easier than Rain-X! And it lasts a whole lot longer!:xyxthumbs
As soon as it gives out, I'll try Zaino on the windows all around. Perfect optical clarity and whatnot, it shouldn't affect the clarity of the glass at all.
:wavey