A bit late but - First - close your PC case for anything but air and dust particles and even the latter are unwanted, then wash the card with distilled water, soak it for a while to dissolve all the urea and salts out of it. Then comes the 2-propanol to take out all the water, then leave it on the balcony for a good 2 weeks to dry or you can use hair dryer if you're in a hurry and it'll be better.
I'm not saying good because the fact you got mice in your PC case tells something about you and now it's try and save what you can (don't know how much time the card was soaked in urin, probably till it evaporated and then some).