How to clean up the numbers on a speedometer

Just wondering if there is a decent way of cleaning the numbers on a speedometer the white numbers have yellowed. Maybe a solution with bleach ?
Thanks !
Dave

There isn't anything you can do with the letters, it is rust coming thru the plate. You can send them off and get them redone are you can get the decal set for all your gauges and put them on. They look pretty good if you don't have the big bucks to spend on getting them redone. Ronnie in Okla.

....what he said,...the decals are available from Performance Car Graphics,...about $60, all the gauge styles are available,....I used them on my Charger