Cannot delete domain because it's referenced by other objects

Scenario

You're trying to delete a domain but it fails to delete because there are resources referencing this domain. How to delete such a domain?

Solution

Delete all ad hoc views and reports that are using this domain as a data source. You can try getting a list of views by removing all items from the display tab in domain designer. This will show you a pop-up of all resources affected by your changes. You'll need to delete all these resources. If you cannot delete the domain even then, go through all your organization temp folders as superuser and delete all the contents from these folders. The resources you're looking to delete are aru*, adv* and sl*.