ewwwww, this thread can get pretty gross I'm guessing.
That's the reason why I q-tip my ears every single night after I take a shower. I hate it when people dont' and you can even see brown gunk all over their ears from a few feet away. Then they ask to listen to your iPod. I just immediately put my iPod away. I guess you should put some rubbing alcohol on a towel clean the earbuds and keep your ears clean to prevent new dirt getting on the earbuds.