Deleting unused audio files

[Beyond The Pale]

Does anyone know a quick and easy way to delete the unused wav files from the directory 'audio files' after a project has been completed?

Thanks.

[Benneedshelp]

That's a good question I'd like to know too. If there are multiple sessions drawing from the same audio files folder? If it were just the one session, you could select unused regions from the audio bin, and delete them (as I'm sure you're aware of). But for several sessions, would be especailly helpful to know.