How to delete a permanent controller?

[AthreshK]

I have a controller that has been put as permanent.
Get.put(SessionController(),permanent: true);

When I try to delete it with
Get.delete<SessionController>();

I get the error
"SessionController" has been marked as permanent, SmartManagement is not authorized to delete it.

I want to keep the controller between a few named routes so I don't want it to get automatically deleted unless I do it myself.

[jonataslaw]

Get.delete(force:true);