Q: How to delete garageband instruments and lessons after deleting files from library?

I used this method to delete all my Garageband files http://smallbusiness.chron.com/delete-garageband-mac-29847.html

However I still see a message in storage settings that say garageband instruments and lessons are using 880.3MB. It was about 3-4 GB before I tried the method above. I have never used Garageband or made any lessons. Hope this is enough info.