How can I scan for unused clips then delete them in FCP 10

I have a large (for me) library of clips from a vacation. I am now finished my editing efforts. Many of these clips were never used in the projects that I created.

To save space, I would like to "automatically" scan for and select all clips that were not used. I can see the used ones indicated in the browser (orange line) but as yet I have not found a way to find the unused ones and then delete them with a filter, scan and delete.

I only want to delete clips where nothing was used. If a short segment was used, I'll keep it.

Does any one know if FCP can do this?

Is there another utility that can do this? Someone referenced a FCP "Library Manager" but it didn't appear to have that feature.

Thanks

Barry

PS I have removed all the transcoded and proxy media.