Can I wipe free space on my hard drive?

For privacy and security reasons, you can set CCleaner to wipe the free areas of your hard disk so that deleted files can never be recovered. Note: Wiping free space can take a substantial amount of time.
For More Information Please Refer:
https://www.ccleaner.com/docs/ccleaner/using-ccleaner/wiping-free-disk-space
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