Ccleaner is a free tool that allows you to pinpoint specific files on your Windows computer and overwrite them before you delete their directories. Once installed, you can use ccleaner just by

      clicking on the

      Tools

 

 

 

 

 

 

 

 

 

 

 

     

 

Drive wiper

      In the wipe options select free space only

      In the security, choose any one of them(very complex overwrite-35 passes irrecoverable) Select the drive which user want to wipe.

      Done