Finns ett kommando i OS X för att "tvångstömma papperskorgen"
"If you can't empty the Trash or move a file to the Trash
For example, this message might appear when you try to empty the Trash: "The operation could not be completed because the item '(item name)' is locked."
First, try holding the Option key as you choose Empty Trash from the Finder's File menu."
Här finns mer info: You can't empty the Trash or move a file to the Trash