[.JJ.]

I apply Rain-X to all exterior windows, it's almost a necessity in my climate.

My only gripe that it doesn't last very long. It seems like I need to re-apply it after about two good rainstorms.

 

[.JJ.]

I have tried this on my windows:

http://www.clearkote.com/Clearkoteweba/QuikShine.htm

It worked a little better than Rain-X, but honestly nothing lasts that long around here with as much rain as we get. As far as waxes go, I hate getting wax on the trim around the windows, it's a PITA to remove.