weirdly, my 13" mbpr has probably spent 95% of it's 3 year life outdoors, under a roof but otherwise exposed to sunlight and natural conditions. Once a week I blow it down during blowing leaves off the deck with a petrol leaf blower and it pretty much looks brand new. Just my 2c.<p><a href="http://staingate.org" rel="nofollow">http://staingate.org</a>