Empty trash - Mac

The dreaded 'The operation cannot be completed because the item "...." is in use' message. This is the remedy (from http://www.lancelhoff.com/cant-empty-trash-on-a-mac/):

1. Drag the file from your Trash bin to the Desktop.
2. Launch a Terminal Go > Utilities > Terminal and type the following into the terminal window leaving a space after f:

cd ~/.Trash && sudo rm -rf

3. Drag the file from your Desktop to the terminal window and then press Enter
4. Enter your password when prompted and press Enter