Okay, my problem is that whenever I put certain games in my Gamecube they sometimes wont read the disc. I noticed on the back of the disc that theres a smudge that wont come out with just water and I dont want to ruin the game by using a different substance. I was wondering if anyone else has had this problem and if so how they fixed it. It's happeneing with some of my more favorite games and it looks like just a smudge that wont come out on the back of the game itself it hasn't happened to all my games just the ones I play the most. I'd appreciate any ideas even if you dont have a clue thanks.

Get an electric DVD cleaner and/or use alcohol to clean the disk. Also get a CD/DVD scratch remover and run all the games through it. If you can access the glass eye in the Gamecube clean that with alcohol on a Q-tip as well.

okay thanks I'll try that