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There is nothing wrong with the right abrasive cleaner on glass, I do it yearly when it is time to replace the rain repellent. You can get abrasive glass cleaners, some times called scratch removers at auto parts stores. This is what I would recommend as the abrasive is fine enough in these products to polish the glass, not scratch it.
I would start on the outside to figure out how many cycles it takes to get off whatever is on the glass. The last time I redid the rain repellent, it took three rounds to get it clean. For glass, clean gets you want is called "water break." This is when a spray of water on the glass results in a thin continuous sheet of water on the window. There are no little ridges of water flowing of the glass, just a solid sheet covering the entire window that slowly slides down, with a dry area appearing at the top first and progressing down the window. Then you could get to the inside but as abrasive window cleaners are removed with water, it could get a bit messy.
Note:
I use STP Vision Blade rain repellent (no longer available) and yes it does last a year when applied on a clean window. RainX would last a lot longer too if the glass was cleaned to "water break" before it was applied. The best rain repellents are in order: PPG Surface Seal, Pilkington Surfex 100 (both aircraft products), PPG AquaPel (Automotive glass shop application) and STP Vision Blade (if you can find it). What all of these have in common is that they come in single application packaging (glass vial in applicator that you break before application). All of these will last a year or more with proper cleaning (no harsh chemicals or abrasives).
Brooks
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