Mine had a gnarled textile and didn't read CD's anymore. When it started to stop reading DVDs as well, I tried cleaned it up.
I used a CD Laser lens cleaner. Not a DVD one, a CD. Put it in iTunes, and played it as the voice instructed me. Then I wrapped my glasses cleaning cloth around a thin plastic card and gently pushed it in the DVD, moved it slightly and pulled out. Gave another run with the CD Laser Lens, and it resumed working.
I believe the CD Laser Lens Cleaner would be enough, though.