I also think it has to do with the color. When the pillars are hot and the water dries on the hot surface, water spots will happen. It is the same as washing a black car in the sun and letting it air dry.
I keep mine perfect with a sealant (as Gary suggests) and I also wipe them down with detailing spray. Another thing I do is teach people how to close the door WITHOUT putting their fingerprints on the doors. I know this sounds picky but it helps.
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