Quote Originally Posted by Graham Mitchell View Post
What I've heard the best thing to do is to get the board out of the cartridge and rub the contacts with a pink rubber pencil eraser. Gets the crap off and won't damage the contacts. I haven't tried it myself, though.
I prefer using a white eraser, it doesn't leave residue behind like a pink one does. I usually clean the cart with alcohol + q tip, then use the white eraser and then I wipe it down with a q tip again.