CCleaner has secure file deletion after I wrote to the developer many years ago to introduce this feature.
However, does it securely erase the 'cluster tips' and 'alternate data streams' of the files too?
Many of us use or have used the free Eraser program which cleans these areas too. A file is not completely erased if these areas are not cleaned too. So if CCleaner doesn't, I hope the developers will work on it.