Hey guys,
I was just wondering what your cleaning solutions were to your old stubborn games that don't work right.

My method:
I usually use rubbing alcohol at first.
If that doesn't work, I take it apart and sand the contacts down with 1000 grit, then to clean the residue from the sanding, I spray the game with Scrubbing Bubbles. I then wipe down the contacts with a paper towel and blow through the chips. I then let it dry for 15 minutes and then works as if it were brand new.