MacKeeper

You might find something of interest in this thread especially with GGJstudios posts:
http://forums.macrumors.com/showthread.php?t=1324925&highlight=mackeeper

 

Very contentious and much argued. I personally quite like it for weeding out duplicate files (that by its nature is not something that can happen automatically) and having a clean up of caches, extra language files etc. Others argue that it is completely unnecessary.

It does, however, have some features that could do serious damage if used by a novice user, and it could be argued that this isn't made clear enough. More in my review here: http://www.windowstomac.net/2011/09/08/clean-up-time-a-review-of-mackeeper/

 

how do I remove MacKeeper?

how do I remove MacKeeper? How do I go in and scan/clean up/defrag etc?

 

Best way to FULLY DELETE a program​

You don't need to?
Five Mac maintenance myths

 

You don't need "cleaner" or "maintenance" apps to keep your Mac running well, and some of these apps can do more harm than good. Some remove files/folders or unused languages or architectures, which does nothing more than free up some drive space, with the risk of deleting something important in the process.

These apps will not make your Mac run faster or more efficiently, since having stuff stored on a drive does not impact performance, unless you're running out of drive space. Some of these apps delete caches, which can hurt performance, rather than help it, since more system resources are used and performance suffers while each cache is being rebuilt.

Many of these tasks should only be done selectively to troubleshoot specific problems, not en masse as routine maintenance.

Mac OS X does a good job of taking care of itself, without the need for 3rd party software. Among other things, it has its own maintenance scripts that run silently in the background on a daily, weekly and monthly basis, without user intervention.