Yeah, I agree that Invisible Glass is an effective product.
When it comes to the outside windows though, it's straight to the Soft Scrub. Doesn't scratch the glass (though be careful around the edges because it will scratch clear-coat) and does wonders on old car-wash pseudo-wax, accumulated Rain-X from the orange wiper fluid, bugs, tar balls, and most any other thing that can accost exterior glass here in New England. Takes a lot of rinsing, though, preferably with a hose.
Oh, and even though Glass Plus and Invisible Glass both come as pop-up pre-moistened wipes I've never had one bit of success with either, leaving more smears and streaks than when I started. If you're going to have to dry the glass with paper towels anyway, why not just go straight to the spray can/spray bottle? Save the pop-up stuff for Armor-All and the dashboard or other plastic interior bits.
EDIT: When it has to be absolutely positively 100% clean with no streaks/smears, look no further than these:http://www.amazon.com/Gerber-Birdseye-C ... B007VBYVVA
Science IS NOT TRUTH. It is an iterative process asymptotically coming ever closer to Truth, but destined never to arrive there.