I am running Sylvania Cool Blue 9005s in my low beams right now. Sitting in the high beam spot is a set of 100w bulbs!

Its nice. I didn't see much of a difference between the normal low beams and the 9005 high beams in the low spot.
Anyway, you can clean up the lamps by heading to the local paint shop and picking up some extremely high grit sandpaper (I used 1200) and some 3M plastic polish. Sand the lamps until you have removed all of yellowing. The lamps will have a very dull finish on them by the time you are done. When you are done sanding and the lamps have dried, take the plastic polish and a buffer and buff them up to shiny! Doesn't take terribly long, though I would reccomend taking the lamps off of the car to do it. That way you won't run any risk of sanding the bumper cover, fenders, or the hood.