How to Force Empty trash after manually deleting Backup

I had to manually delete one of my backups but the trash would not delete certain folders because 'folder is in use'.

After lots of searches and dead ends (including some frustrated posts here) I found a solution. Adding here so others won't have the same problem I had!

Step 1. Open Terminal and type: sudo rm –R followed by a space. DO NOT leave out the space. And DO NOT hit Enter in this step.

Step 2. Open Trash from the Dock, select all the files and folders from the Trash. Then Drag and drop them in Terminal window. The path of each file and folder will appear on the Terminal window.

Step 3. Now hit Enter button, the Mac will begin to empty the files and folders on the Trash.

Be patient! It took a couple minutes for mine to start working.

I found this here:

https://www.fonepaw.com/eraser/cannot-empty-trash-on-mac.html

Worked for me. Hope it works for you. I'm on a macbook Pro, High Sierra.