I have started pods with command
$ kubectl run busybox --image=busybox --restart=Never --tty -i --generator=run-pod/v1
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Look out for stateful sets as well
kubectl get sts --all-namespaces
to delete all the stateful sets in a namespace
kubectl --namespace delete sts --all
to delete them one by one
kubectl --namespace ag1 delete sts mssql1
kubectl --namespace ag1 delete sts mssql2
kubectl --namespace ag1 delete sts mssql3