This function will list all the files in your Trash, including Trash files on external drives connected to your Mac.
Empty the Trash
Click on the “Empty Trash” button at the bottom right to delete all the files in your Trash. This action can’t be undone and requires access to the Finder (see TrashMe 3 Preferences, Privacy tab).
Check the boxes in front of the files you want to permanently delete, then click the “Delete” button at the bottom right. This action can’t be undone.