This as simple as running:

minikube stop & REM stops the VM

minikube delete & REM deleted the VM

Then delete the .minikube and .kube directories usually under:

C:\users\{user}\.minikube

and

C:\users\{user}\.kube

Or if you are using chocolatey:

C:\ProgramData\chocolatey\bin\minikube stop
C:\ProgramData\chocolatey\bin\minikube delete
choco uninstall minikube
choco uninstall kubectl

In my "Ubuntu 16.04", I use next steps to completely remove and clean Kubernetes (installed with "apt-get"):

kubeadm reset
sudo apt-get purge kubeadm kubectl kubelet kubernetes-cni kube*   
sudo apt-get autoremove  
sudo rm -rf ~/.kube

And restart the computer.

Both the Kubernetes documentation and this page on webhostinggeeks.com describe how to tear down a kubernetes installation.

Per the K8S doc:

1. Use kubectl config delete-cluster to delete your local references. If you want to deprovision your cluster more cleanly, then
2. kubectl drain <node name> --delete-emptydir-data --force --ignore-daemonsets drain the node
3. kubeadm reset Reset the state
4. iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X manually reset iptables
5. kubectl delete node <node name> remove the node
6. kubeadm reset on the control plane to trigger a best effort clean up.

From webhostinggeeks.com:

1. kubectl delete all --all-namespaces --all delete all k8s resources
2. sudo apt-get purge kubeadm kubectl kubelet kubernetes-cni kube*
sudo apt-get autoremove Uninstall kubeadm, kubectl, and kubelet
3. sudo rm -rf ~/.kube /etc/cni /etc/kubernetes /var/lib/etcd /var/lib/kubelet remove artifacts
4. sudo iptables -F && sudo iptables -t nat -F && sudo iptables -t mangle -F && sudo iptables -X reset iptables
5. Manually revert any changes to /etc/hosts file