The cat hiss method - I have 2 cats. one likes hard rock,etc. the other classical and jazz. Anyway if I am playing a classical or jazz so I can just sit and read my cat Bashful hisses if she hears static or whatever from the CD. So I stop the player clean the disk and reload. She then will either hiss again or lays down,I figure it's clean if she lays down. Go figure cats.
take care and enjoy the music
Denny