CCleaner for Mac

So we were supposed to install a couple other programs as well as CCleaner, but I have a mac, so they wouldn't really help....

However CCleaner seems pretty easy to use and is fairly customizable. I already moved a few of my 'safe' sites into the 'cookies to keep' list so they won't be endlessly (and annoyingly) deleted.

One thing that I do to keep my computer running well actually is defragging, a common practice for PC users, but something Apple likes to pretend is unnecessary for macs. However their built-in program only works for 'average' sized files, whereas I download "large" files frequently (movies and tv series), so iDefrag is nice to have.