I am using kubectl apply -f pv.yaml on this basic setup:

apiVersion: v1
kind: PersistentVolume 
metadata:
  name: pv-demo
spec:
  storageClassName: "normal"
  capacity:
    storage: 1Gi
  persistentVolumeReclaimPolicy: Delete
  accessModes: 
  - ReadWriteOnce
  hostPath:
    path: /home/demo/
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-demo
spec:
  storageClassName: "normal"
  resources:
    requests:
      storage: 200Mi
  accessModes:
  - ReadWriteOnce
---
apiVersion: v1
kind: Pod
metadata:
  name: nginx-demo
  labels:
    name: nginx-demo
spec:
  containers:
  - image: nginx
    name: nginx
    volumeMounts:
    - mountPath: /usr/share/nginx/html
      name: pv-demo
  volumes:
  - name: pv-demo
    persistentVolumeClaim:
      claimName: pvc-demo 

Now I wanted to delete everything so I used: kubectl delete -f pv.yaml However, the volume still persists on the node at /home/demo and has to be removed manually.

So I tried to patch and remove protection before deletion:

kubectl patch pv pv-demo -p '{"metadata":{"finalizers":null}}'

But the mount still persists on the node. I tried to edit and null Finalizers manually, although it said 'edited'; kubectl get pv shows Finalizers unmodified.

I don't understand what's going on, Why all of the above is not working? I want when delete, the mount folder on the node /home/demo gets deleted as well.