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Trash

Some files or folders are not easily deleted, particularly when locked or when you don't have write permission. To remove Trash contents for all accounts on all connected volumes, regardless of privileges:

Use the Automation pane.

or

Use the Cleaning > Trash pane.

The Secure Delete option overwrites every byte of deleted contents three times (with 0xff, 0x00, and 0xff again). Therefore, this operation takes a very long time. Wait for the task to complete.