In order to use cleanmgr.exe you’ll need to copy two files that are already present on the server, cleanmgr.exe and cleanmgr.exe.mui.
Use the following paths to locate the files for your operating system.
- C:\Windows\winsxs\amd64_microsoft-windows-cleanmgr_31bf3856ad364e35_6.1.7600.16385_none_c9392808773cd7da\cleanmgr.exe
- C:\Windows\winsxs\amd64_microsoft-windows-cleanmgr.resources_31bf3856ad364e35_6.1.7600.16385_en-us_b9cb6194b257cc63\cleanmgr.exe.mui
Once you’ve located the files move them to the following locations:
- Cleanmgr.exe should go in %systemroot%\System32.
- Cleanmgr.exe.mui should go in %systemroot%\System32\en-US.
You can now launch the Disk cleanup tool by running Cleanmgr.exe from the command prompt.
Source: http://technet.microsoft.com/en-us/library/ff630161(v=ws.10).aspx