8start.com

I just find about hard drive power wash and I am in confident with its capacity, this soft has a premium sghareware version that adds new functionalities such as registrey cleaning. The free version do satisfying job in cleaning the hard drive, after some test I found that itt cleans more than some free and sharewares.

Those who wants to use the free version then here is the link.
http://www.harddrivepowerwash.com/