Let's say you inherit a Chromebook, or find one in a flea market junk store.
It was never Power washed and you don't know its user name or password.

How do you Power Wash it?

Sign out of your Chromebook.

Press and hold Ctrl + Alt + Shift + r.

Select Restart.

In the box that appears, select Power-wash. Continue.

Follow the steps that appear and sign in with your Google Account. ...