Help with cleaning up

Here's my problem: I have a bunch of old and duplicate mp3 on my computer, in my music folder. In my media player (Winamp), I've kept everything clean and nice. I can export a playlist of all the songs I want to keep. I there a way in MP3Tag to crosscheck with that playlist and to show all the files that aren't in that playlist? Am I clear?

Anyways, if any of you can help, it would be very helpful!