title: Cleanup disk space occupied by Docker images
body: <p>I am running docker on windows 10.</p>
  
  <p>I had a couple of images stored in my machine. The total size of these images accumulated to around ~10GB. I have deleted these images via '<code>docker rmi -f</code>' command. </p>
  
  <p>But the space occupied by these images has not been released. If I run 'docker images' command, the deleted images are not listed in the output of 'docker images' command(but the disk space is not cleaned up).</p>
  
  <p>How can I improve (ie. reduce) the disk space used by docker?</p>