Erase slack space on Microsoft Windows

A lot of information may be stored on a drives slack space. If you want to get rid of these artifacts then run the usual tools to clean up the system like 'Disk Cleanup' and then run cmd.exe as an administrator and execute the following:

C:\Users\user>cipher.exe /w:C: To remove as much data as possible, please close all other applications while
running CIPHER /W.
Writing 0x00...................................................................................................
Writing 0xFF...................................................................................................
Writing Random Numbers.........................................................................................