If you ever loose track of the password on your Chromebook, find that the Chromebook is running oddly or want to sell a Chromebook, you can remove your Google account and readd it. The easiest way to do this is a feature called Powerwash. To pull it up, open Settings and then click on Advanced Settings. There, you’ll see the Powerwash button. Click it and then you will remove all of the user accounts installed on the device, basically performing a factory reset.
Powerwash can also be run by clicking Restart while holding down Control-Alt-Shift-R at the login screen. This brings up a Powerwash prompt where you simply need to click Powerwash to remove your data. The first time you login once the Powerwash process is complete, your apps and data start to sync back to the Chromebook.