apesgrapes

well, it recognises a disc is in, but more than half the time it can't display tracknames & won't play, keeps struggling and will say BUSY if i try & get stuck into a menu. possible clue, i've blown in it and its worked, but not for long. when it does recognise a disc it works fine until the next disc goes in. does it just need cleaning? if so how? thanks for any help.