https://www.saotn.org/windows-server-2012-r2-disk-cleanup-dism/

  - Open and elevated command prompt and run: <code> dism.exe /online /Cleanup-Image /AnalyzeComponentStore </code> to get info on when the last cleanup was done and other misc info.
  - To perform a basic cleanup run: <code> dism.exe /online /Cleanup-Image /StartComponentCleanup </code>