ClaptoVaugh,
For windows, I'll just use whatever cleaner is handy (Windex, Zep, store brand...doesn't matter) and black & white newspaper. If I do get any streaks, it's because there was some spooge on the glass and I clean it again. After doing the inside and out, I'll finish with some RainX on the outside...wow, you can hardly tell there's glass in front of you.
I've heard of people also using Stoner's Invisible Glass or some such...but I have no reason to change...it just takes elbow grease and newspaper.
Bogatyr