Clearing down Chromebook profile data.

It's sometimes useful to be able to cleardown the Chromebook user profile data from a group or class-set of Chromebooks. This can help with odd issues you run into with respect to application caches, particularly local Android apps.

Fortunately you can do this from the admin console 

Devices -  Chrome - Devices

Select devices from the containing OU. You can only select a maximum of 50 devices at once. If you have more you simply need to repeat the process.

Click "Reset selected devices"

Select the option "Clear User Profiles".

This removes all user profile data but keeps device policy and enrolment.