How can I delete some metadata for an entire library

[guardian1691]

I added the lyrics plugin and scanned my entire library before realizing I didn't have my metadata set to go in the same directory as the media files. I fixed it but now all of the songs technically have lyrics downloaded, so the nightly task doesn't make any changes. Is there a way to mass delete all of the downloaded files?

If it makes a difference, my server is on a Windows machine, and I know some metadata is in the ProgramData directory, I just don't want to blow away my entire server's metadata.