I have seen alot of lamps that people are asking how to clean. I had good luck using napa's or advanced auto's glass scratch remover. it is disks that attach to your drill and you add water and it buffs it out. makes them look like new...
yeah those little bulbs are 4 bucks a peice. there are three in the heater controls on the back of unit little brown led like twist outs and two in each switch(cruise, defrost)