It's from hard water drying on the car. Not easy to remove, but sometimes it goes away. Blame it partially on the crappy paint. I find that spraying a light mist of detail spray while the car is still wet before drying helps a little. Clean the area as best you can and let it sit for a few days before trying any polishing. Clay bar might work, so I would give that a shot also.
Never wash your car during direct sunlight exposure. Water spots are pretty much guaranteed if you do. Best time is early morning or late afternoon.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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