Use 40 Vol hair product on it. Just like how I re-whiten old consoles. I've done it to Supersystem cards before without any ill effects. Might not make it perfectly white but will definitely improve it.
Thanks for the tip. Does it matter what brand or type? Google turns up just a generic cream...do you just lather a bit of it on the entirety of the card? How long do you wait? Will it bleach the parts with printing/color/text? Just want to make sure I do it right the first time so I don't R.I.P. my Lazers card.
And the Hamilton analogy is apt, Monkey, although only one side is tanned so it is probably more like Ross from Friends with his horrible one sided spray tan.