Mailstrom seems to be about unsubscribing, as somewhat does clean.email (ironically I find their home page to be the opposite of clean). I'm talking about finding the random 40 meg videos my dad sent me that should have been a YouTube link. Ideally such a tool WOULD find the YouTube link, and edit the email to include that.
You absolutely could as an initial step in a poor man's solution. However, I wouldn't call this a great UX. It means that all the ones I want to keep will continue to appear every time I need to cleanup. That doesn't group by sender, nor does it sorting out YouTube-like forwards from my dad's friends from the actual content my dad has sent.
I could go on and on for what I'd consider a great cleanup experience. It's surprising to me that such a thing doesn't exist, nor is it the kind of thing that's built into Gmail itself. You'd figure they would be best to offer a simple cleanup experience that has sane defaults.