Delete All Trash does exactly what it says it will - it will delete all your trash from all and any volumes on your Mac. Even those stubborn files that won't go away. It will use the Administrator password to remove and clean away any and all files from all connected drives on your Mac.
It provides a simple and intuitive process that runs in the background. The only thing the user needs to do, is put in their Administrator password. Then it will allow them to automatically have the trash emptied on all and any connected hard drives.
Everyone and anyone that is having trouble with their Trash being full on OS X.