crazymikey
+1y
Take 1500 and 2000 grit sandpaper and wet the lenses and the paper and wetsand the lenses. They will go all milky and filmy and look nasty while you're sanding,but after a few minutes,stop and wipe it all off and dry them,and then get some wax or polish and rub it all over the lenses and they should come out like new.
This was a common problem on my Ford Contours,with the headlight lenses yellowing and going hazy over time,so I learned this little trick that works wonders from Contour.org.