Here is some info I found
When a CD-ROM is giving you problems, the first thing to do is clean it. A most common method for cleaning CDs simply involves using a smooth clean cloth and gently wiping the CD from the inside out, never with a circular motion. Another method involves using warm water and mild soap on a cloth and using the same kinds of straight strokes from the center of the CD outward. After the CD has been dried (also with a smooth cloth), you can try it out again. A good cleaning may be just the solution to a problematic CD-ROM.
Periodic cleaning of CDs is good to do even if you are not encountering obvious problems with your software. A dirty or smudged CD can slow down a game's performance, and make your CD drive work harder to read the CD. This will be more obvious in faster CD ROM drives because they must slow down in order to read, and re-read the data. A simple cleaning can improve a game's performance.