If you are using UnleashX as a Dash or App you could add this to the config.xml
If done this way once the user clicks the Clear Cache button in the dash you would not be promted or given a chance to back out. CODE
If you would like the user to be given the chance to continue or back out when they click the Clear Cache button then you could add this instead.
CODE
- Are you sure you want clear all Caches?\nPress Yes to Continue or No to Abort...
It really doesn't matter if you delete the complete CACHE folder on E drive as the CACHE folder will be generated again by the xbox again when needed.