Remove Old damaged Integrations



I have a question about integrations in the integration studio.


I have three integrations which I can not remove. They are deactivated.


When I double click on one of them I receive a popup message which states: 

Header: Failed loading Integration Point <Integration Name>

Message: The Integration Poiny is currently inaccesible. Would you prefer to deactivate it?

Deactivating the Integration Point disables all its scheduled jobs and federated data.


When I single click these integrations I am not able to remove these integrations by selecting the "red removal cross" on the top since it is grayed out.


Is there another way to get rid of these integration points?


Kind regards,