Last tested: Aug 10, 2018
On a given explore or dashboard, you can click the gear in the top right, and then "Clear Cache and Refresh".
On the Admin > Datagroups page, you can refresh all the cache associated with a datagroup.
There is no way to break ALL cache at once; the best you can get is to clear all datagroups. Ideally, you have datagroups for every model and/or explore.
This content is subject to limited support.