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if you are THAT paranoid that someone is going to come on your computer and see what you have been saying over IM or looking at on the internet, and you don't know how to delete that stuff youself...then go for it...

but seriously...lose the paranoia...

or just stop looking at inappropriate things
 
I like the promise of deep cleaining, I don't expect it will hide things from the government but perhaps family members or a nosy roomate with a little tech knowledge.
 
My gut is that you'd have to be doing some serious sh** it justify that type of system clean AND/OR hide/coverup your tracks from your computer savy wife who suspects you of cheating or frequenting those porn sites. :D

~e
 
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