Just How Good Are They: ? (hard drive cleaners)

[Basic.J]

I am rather new to posting here but I seem to keep reading about software but how good are the so-called hard drive cleaners and are they as good as they claim to be.

I have Window Washer 6.5. Build.
I have Cyber Scrub.

Both claim to work wonders and miracles , both claim that if I delete my documents and clean my hard drive with them. All documents , music and files can never be recovered , but how much of this is true.?

Do you use these.?
Have you in the past.?
Have you used something better.?

What are the best FREE downloads.?

Links and thoughts on this topic.