You can buy the CD drive cleaner. The problem could be related to Dirt, could be the driver, could be the hardware itself. you won't know until you buy the cleaner. But i doubt it could fix it. If you have the tray eject in your cd drive, you can't really reach and clean the lens. and even if you do, don't try to clean the lens of the drive, you probably would damage it. like shiv said, buy the cleaner, it looks like a simple CD-ROM with brushes attached to its bottm part where lens reads the data.