Clean the disc with mild dishwashing detergent and water to remove surface dirt and grease. Wipe the disc dry with a soft lint-free cloth. Always wipe around the disc, not across the surface from the center out.
Insert the disc into a CD player. If the CD plays, you've solved the problem. If the initial cleaning did not fix the problem, a repair is needed.
Dampen a lint-free cloth and wring out all excess water. Place a small amount of fine grit car polish on the cloth. Cover the shiny side of the CD with a light coating of polish. Allow the polish to dry until the disc is covered with a fine white film.
Polish the disc with a dry cloth, buffing in small circular strokes working around the disc from the center to the outside edge.
Clean and polish the label side of the disk to remove static electricity and any other contaminants that may be present. Apply a very thin coat of car paste wax to the data side of the disk and buff with a soft cloth until the disk is polished to a uniform mirror finish.