The headlights on my 2001 MR-S were looking a bit tatty and although the condensation inside seems to have been sorted, the outside was looking yellowy and pretty dull.
Found this and thought i would share it : http://autoshepherd.com/blog/2011/05/10/headlight-restoration/
I used 1000, 1200, 1500 then 200 grit, then an electric polisher with some brasso for the last step, and they look good as new now...
The car looks so much better for it now, the best 30min improvement for any owner - I'll post some b4 and after pics once I find my camera.
Cheers