title: How to trigger manual clean of Hudson workspaces
body: <p>We have a Hudson cluster with eight nodes. When a particular code branch is no longer in active use, we disable the build job, but the workspaces for that job still hang around taking up space on all the nodes. </p>
  
  <p>I am looking for a way to trigger workspace cleanup across all nodes. Note that I am not looking for a "clean workspace before build" solution.</p>