CD disc are very durable but they always stand the chance of getting scuffs and scratches making them unplayable. Before you throw the CD disc out you may be able to try one of these techniques and bring your CD back to life.

Check for Scratches
If your CD is not playing correctly or skips songs there is a good chance your CD disc has a scratch on the bottom of the disc. You can visually inspect it by flipping it over and look for scratches that are perpendicular to the disc and are running from the center out.

Clean the bottom of the disc with water or rubbing alcohol
You always want to check the CD disc to make sure it is free of dust, dirt or other contaminants even if the disc is not scuffed or scratched. To clean the bottom of the disc run warm water over the bottom of the disc or you can use liquid soap or rubbing alcohol. When you are wiping the disc it is best to use a lint free cloth and wipe from the center of the disc to the outer edge.

Polish the disc with a light abrasive material
Polishing the bottom of the CD disc should be your last attempt to recovering the data from the disc. There are several household products available but using a baking soda toothpaste will give you the best results. The other product that works well is a fine grit car polishing wax. Apply the wax or toothpaste to a lint free cloth and polish the disc in a clockwise motion. It is best to focus on the scratched area instead of the entire disc.

Try using Vaseline or furniture wax
Apply a thin amount of Vaseline or furniture wax to the scratched area.

Use a 60 watt light bulb
Hold the bottom of the CD disc up to a 60 watt incandescent light bulb for 20 seconds. You want to hold the disc about 3-4 inches away from the bulb and rotate the disc. After about 20 seconds put it into the player and see if it plays.

All of these methods are a temporary solution to getting your CD disc to play. If you are able to get the CD to play it is best to make a new master copy of the disc. If you are unable to make a new CD master yourself you can look for a company that offers CD duplication.