How To Reset A Chromebook 11. Describes how to reset or Powerwash your Chromebook. I do a powerwash every month.

The account you sign in with after you reset your Chromebook. Hardware platforms affected. Press and hold the Refresh key and then press Power button.
When the computer starts up release the Refresh key.
In the box that appears select Powerwash Continue. And that is how your factory reset your Chromebook. Then spread them apart to zoom in or pinch them together to zoom out. It will restart your Chromebook hardware like your keyboard and touchpad and might delete some files in your Downloads folder.
