Things You'll Need
Instructions
Dampen a cotton swab with isopropyl (rubbing) alcohol. The swab should be wet to the touch, but not dripping.
Run the cotton swab across the data side of the disc, taking care to make outward strokes from the center of the disc; this is the easiest way to prevent unintentional scratching.
Run the disc under tap water to clear away any extra dust or debris, then use a towel to absorb any extra moisture. Your disc should now be clean.