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just stay in the Mantainence section, go down till u see where it says Last 10 days, or 30 days, and switch it to Beginning and just flip through the pages, good post a little while ago about this like Dexter said
or if you wanna clean up inside(I really recommend clean up outside first, if it doesn't work, try inside). try http://www.mkiv.com/techarticles/headlights/index.html, I used the OVEN, it works , I'm not sure if it'll work for your GS.
For outside, I used 2000Grit sand paper and Novus heavy scratch remover(ordered from http://www.airsource1.com/, search for Novus Polish Sampler #s 1,2,3, good size) works good.
Chances are if the stuff out there listed on the replies doesn't work for you, you will need a new lens. Not exactly what you may want to hear, but it replacing the lens on my SC was the only way to finally fix it after using all the "snake oils" that folks indicated would fix the problem.
Good Luck!
BTW, what type of lasers do you work with? I am a Director of a company that manufactures a excimer laser for the medical field (not lasik) and am always looking for good people for future needs we may have.
Try Zaino Z14. I used it on my lights and it tookout a lot of the haze that was on. The bottle costs about 14 dollars i think. You have to really scrub it at. Maybe even apply a couple of times, but it will take out a lot of marks.
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.