Things You'll Need
Instructions
Moisten a clean, lint-free cloth with glass cleaner or rubbing alcohol until the cloth is damp, but not dripping.
Clean the Gamecube disc's read surface (the unmarked underside of the disc) by grasping it by the outside edges and wiping in straight strokes from the center hole to outside edge. Do not use circular motions. Most Gamecube discs can be fixed by clearing the read surface of accumulated dirt and marks.
Dry the disc off then examine it under a light. If marks remain, these may be surface scratches on the disc. These can be removed by a professional disc resurfacing company (see Resources).