DIY site Instructables highlights an inexpensive method for breathing new life into those old, scratched CDs you’re still clinging to. Their solution: a dab of Vaseline or any type of petroleum jelly.
A soft cloth or disc cleaner, petroleum jelly, and some ancient scratched CDs are all that is required for this project. Using the disc cleaner/cloth, apply the jelly to the CD. After applying it in a thorough manner, the excess grease needs to be removed. Take a cotton ball, swab it with some rubbing alcohol and start cleaning it off. The idea is that the petroleum jelly will fill in the scratches on the CD, making it—hopefully—readable.