Remove Unused Audio Files from GarageBand Project

Is there a feature in GarageBand to remove unused audio files from the project?

I find that if delete audio tracks, the audio files from those tracks never get removed from the project, so the file size just grows and grows, even though there are fewer tracks in my timeline.

I know I can "show package contents" and try to pick out which audio files are not being used and delete them manually, but it seems ridiculous to have to do that (and risky).