Duragloss Nu-Glass!
I tried all the suggestions on here except the lime-away and soft scrub. I didn't have any lime away, and had tried Bon-Ami (forgot to mention this in the original post) which did basically nothing. My process with all these things was to apply smack dab in the center of the window using a moderate to heavy amount of elbow grease, then check the results. In every case, the spots remained pretty much unchanged.
I resorted to googling and found a post (don't even recall where) in which someone in my position said that Duragloss Nu-Glass had solved their problem. I didn't think too much of it at the time, but when I was at CarQuest picking up some AquaWax I saw the bottle of Nu-Glass and figured I'd take a $6 gamble.
Today, I put some Nu-Glass on a regular paper towel and buffed a small area of the window as I had with other products. After buffing clean with a MF towel I was stunned to see that area completely spot free! I quickly grabbed an old buffer (one I wouldn't consider using on the painted surface) and applied some Nu-Glass to the pad. After rubbing it around manually to avoid slinging, I fired up the buffer and spent about 2 minutes buffing the driver's window. Next I buffed clean with MF towel and was blown away with the results. The window was spot free except for a couple small areas I'd missed plus the corners the buffer wouldn't reach. I easily finished those off by hand, then applied some AquaWax to help prevent them from forming in the future.
Honestly, I had figured the spots were etched into the glass and had almost given up trying to remove them. I'm so glad I gave this stuff a try - and encourage anyone with stubborn water spots to do the same.
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