Thanks for the tips Mark :)

Also, to speed up removing your Unused Masters and Shaders, you can assign hot keys so you don't have to go through the menus everytime you need to clear them.

Go to File, Preferences, Keyboard Shortcuts, then select Application for Context, and
Edit for Category.  You can then input the shortcuts you like (I use the numbers 1 and 2)
and assign. 

Have fun!