What is correct way to delete rancher/kube from node

I deleted nodes in rancher, deleted cluster in rancher and created new cluster on rancher with new name.

I added same nodes but I get pods from old cluster.

Then I repeated but also delete docker data with following commands:-

sudo docker stop (sudo docker ps -qa) sudo docker rm (sudo docker ps -a -q)
sudo docker rmi -f $(sudo docker images -q)
sudo docker volume ls -qf dangling=true | sudo xargs -r docker volume rm

and again I get old pods and secrets to download private images in newly created cluster with new name.

Could you point me at place where I can see how to delete cluster data from nodes and rancher ?

See https://github.com/rancher/docs/pull/430, this will be live soon.