Clearing hard drive for resale

[Killakil1]

Is: reformatting Windows (3x) > active killdisk free on C: and SSD (3x) > ccleaner wipe free space (3x) > reformatting Windows (1x) enough to make files deleted from the recycle bin unrecoverable?

Just need a piece of mind. Thank you.

 

[Tmagic650]

You can do this:
http://pcsupport.about.com/od/toolsofthetrade/ht/write-zeros-format-command.htm