As for gutman, dont waste your time, 35 passes is 100% pointless, created 15 years ago. It's only purpose it serves is to stop countless users requesting it, and not losing users because of not having it.
Gutman is also overkil for hard disks...soft disks, like USB sticks and memory cards yes, hard disks no...unless you are scared that they will use an electron microscope to determine what was on your drive (yes, they do this...I am a digital forensics major...but is it EXTREMELY EXPENSIVE...not really used for criminal research).
If you are that paranoid, look up jetico software and use active wiping in BCWipe. CCleaner could probably look to this to see some new options in the environment. However...wiping caches while caches are in use gives stange and essoteric results....