I've been using KAIO for all my glass, and really like it.... glass stays cleaner longer, and I haven't been able to beat it for beading. I use Invisible Glass to clean between apps.
I notice if I use wax on the windows and it doesnt have any cleaners in it (like a pure caranuba) you will get streaking. I believe RainX is the better choice but thats not something that I always have lying around, so if I use wax I make sure its a cleaner wax. Never have any problems with it.
