How do I remove all old data in iMovie '11

In iMovie '11, I've started a few projects that didn't work, so I deleted them out. Before I started the projects, I had 32GBs free on my computer, and before I deleted them, I had 2GBs free on my computer. Once I deleted them, I still had 2GBs free on my computer. How do I delete the old "deleted" data from these files? Currently, I can't save anything on my computer and I don't want to wipe my hard drive.

I'm not sure if that would work or not, but I went and deleted the master files in Finder:
User/Pictures/iPhoto Library/Masters.
170GBs later, I have space again!
Thanks for the help.

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