Deleting a namespace that is hung with "terminating"

If you have already tried something like the following: 
oc delete project dev --force --grace-period=0

#Most likely Kube is set in the finalizer which does not let the namespace to be removed. here is one way to do it.
kubectl get ns PROJECTNAME -o json  > tmp.json
vi tmp.json

#Make sure finalizers are empty as follows

```
"spec": {
"finalizers": []
}
``` 

#Save and exit

#startup a proxy to access the api via curl
kubectl proxy

curl -k -H "Content-Type: application/json" -X PUT --data-binary \
  @tmp.json http://127.0.0.1:8001/api/v1/namespaces/PROJECTNAME/finalize

#Now the namespace should be gone
kubectl get ns PROJECTNAME


source: https://computingforgeeks.com/how-to-force-delete-a-kubernetes-namespace/