This docs article shows how to delete dashboards, but only if the user has access.

https://docs.dataminer.services/dataminer/Functions/Dashboards_and_Low_Code_Apps/Dashboards_app/Creating_and_configuring_dashboards/Deleting_a_dashboard.html

We have a number of redudnant dashboards where we have no idea who the editor is, but need to delete.

How can we delete old dashboards where nobody has edit access?

example where there is no edit or delete right click option.