Disk Cleanup is a small utility that comes inbuilt with every Windows operating system. One can access Disk Cleanup by right click on any disk drive and choose Properties.
What is Disk Cleanup?
Disk Cleanup (cleanmgr.exe) is a computer maintenance utility which comes with Microsoft Windows and is designed to free up disk space on a computer’s hard drive. The utility first searches and then analyzes the hard drive for files that are no longer of any use, and then removes the unnecessary files.
How to restore missing Disk Cleanup button in Windows 10/8/7?
Because of corrupt Registry, you may find that the Disk Cleanup button is missing from the Drive Properties box on your Windows 10/8/7 PC.
To restore the missing Disk Cleanup button, go to start and type Regedit to open the Windows Registry Editor. Navigate to the following key:
Here, Right–click on My Computer and select New > Key. Rename the new key to cleanuppath.
Now one right pane of cleanuppath, double-click the Default value to edit its value. In the Value Data field, copy-paste the following path:
%SystemRoot%\System32\cleanmgr.exe /D %c
Click OK and exit from the Registry Editor.
Above changes in Registry will fix the problem and you will now be able to see the disk Cleanup button.