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I use AG Fast Glass after the windows have been polished, find it quicker and easier than the polish.
As for Rain X, it does work well but if your glass is cleaned and polish you will get the same effect. Otherwise try using some wax such as 476s although make sure to apply VERY thinly and wipe off totally, otherwise it has a tendency to go a little hazy especially in the warmer weather.
Deep clean exterior glass AG Glass Polish or Einszett Glass Polish and waxed with Zymol Titanium, treated to a QD when dirty or after a wash with Clearkote Quickshine.
Inside Glass - Some normal trade glass cleaner spray my mate gets me. Seems identical to AG Fast Glass without the costs !
On the daily drive glass cleaned inside and out with the above and rain repellant treated with Duragloss Rain Repellant Glass Cleaner.