# Kill all running containers:
docker kill $(docker ps -q)

# Delete all stopped containers (including data-only containers):
docker rm $(docker ps -a -q)

# Delete all exited containers
docker rm $(docker ps -q -f status=exited)

# Delete ALL images:
sudo docker rmi $(sudo docker images -q)

# Delete all 'untagged/dangling' (<none>) images ():
docker rmi $(docker images -q -f dangling=true)