I was experimenting with the "Clean Media Pool" function of Vegas Audio v2.0d.  Before trying it I read the help file.
The help file says that the "Clean Media Pool" function does the following: "All files are removed from the Media Pool."  
This didn't seem like a very friendly feature so I played around with it.  It appears that it only removes "unused" media files from the Media Pool.
Please fix your help file.
Bob