Cleaning unused space on disc


I have the basic Bit Defender on several Windows computers.  I see the "File Shredder" and understand what it does.


My question is: Is there a way to shred all unused space on a disc? I used to use CC Cleaner for this and will go back to that if Bitdefender can't do it.


I see an "Upgrade" for my version of Bitdefender that includes more utilities - any idea if one of these will do what I want?

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