The clean up operation was successfully initiated, but did not complete within the specified time. It is still running and ...

The clean up operation was successfully initiated, but did not complete within 
the specified time.  It is still running and may still complete successfully.
You can track its progress by viewing the system log (Source FailoverClustering)
and the Microsoft-Windows-FailoverClustering-Operational applications and services
log using Event Viewer on the node.