It is most definitely automatic car washes. My 2011 has the same yellowing and scratching on the headlights. The first two years they looked like brand new while I did all hand washes every month or so. Unfortunately the past year was hectic with work travel and with being sick, so I would run it through a car wash occasionally just to keep it clean and I have noticed the headlights yellowing badly (I knew better but did it anyway, so now I must do my penance). I will be doing the Maguire's restoration soon and will post before and after pics.
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