What a great thread! I just bought a 2013 Mustang Convertible this last week and I think I am going to have to take it in to a professional detailer. The day I purchased it it had been raining so I didn't get a great idea of what the paint looked like. Well, I learned my lesson. I brought it home, washed it up and low and behold there were terrible water spots etched in to the paint. I did my best to work them out: started with Meguiar's clay bar, followed with a round of Meguiar's Scratch X 2.0 and ended with Meguiar's NXT wax. It does look better and the spots are less noticeable, but they are definitely still there. I'm going to have to find a good detailer in my area to see if they can get these out. I am pretty meticulous with my vehicles and this is driving me nuts!