Ok so i have been trying a couple diff. Things over the past couple days. My consensus is theres got to be a chemical stuff/paster that you just rub on there. the 50/50 water/vinegar mix washing the windshield with newspaper and then claybarring worked ok, you could still see quite a few water spots for my liking. Last night i used the "0000" steel wool and then rain-x'd the windows like from the second post which had the youtube video. This technique worked really well but it can take some time. It took me 2 1/2 hrs to do all the windows and moonroof. I had pretty bad water spots on my windows and you can still see a tiny bit of them which im sure you could get out if you wanted but that was enough time for me to spend on windows. They look really good, are super clear and water/towels/dirt just slide right off the windows. So i am happy with the outcome of steel wool just wish it would not have taken that long. Sorry for the long post but thats my thoughts on this so far.
Ok so i just saw the tahoe in the daylight, dont use on mirrored glass, right side mirror is a little scratched not bad though. I should be able to clean it up.