Originally Posted by
Gameguy
Did you try using an eraser on the contacts first? I only do this with stubborn games, having to open up the cases and clean the contacts with a good quality eraser. Usually that fixes any issues with corrosion, I cleaned an NES game with thick green corrosion this way and got it to work. If what you're using is stripping off the gold plating I wouldn't use it, without the plating those contacts will just corrode far worse in the future and might not be repairable then.
I did know of a game store that used the thin green Scotch pads to clean contacts, it seemed to work too. I just didn't want to risk it being too abrasive so I used other methods for myself. It didn't strip off the plating though.