Sometimes you may want to empty the trash folder, but still the files or folders you want to delete refuse to disappear. To solve this problem, use a UNIX command to be entered in a Terminal. Note: do not forget to drag the files to the end of the command.
Replace "*" by spaces. The uppercase "R" is vital. It deletes files and folders.Don't enter the quotes.
Launch the Terminal
Drag the files you want to delete files after this command
Give an Administrator password
For more information about the "rm" command, type "man rm" in the Terminal.
<space> to scroll.
<q> to quit.