I'm trying to find some description and help on Drive Wiper. I don't see a Help link on the Home Page so I came to Forums to see what I could learn here. Unless I'm missing something that would likely be very obvious, why is there no Help on Home Page with details about each CCleaner feature; for instance, what does it mean to Wipe Free Space? What is there to "wipe" from FREE SPACE? More generally, does "wiping" enhance performance? What should one consider before "wiping" anything? I like CCleaner and have recommended it to others. Just looking for more detailed information on its features.
The ccleaner documentation here may help with some of your questions
http://www.piriform.com/docs/ccleaner/using-ccleaner/wiping-free-disk-space