You really DON'T need a "clean my mac" app. They're usually a waste of money/time and can screw up your system. OS X isn't like WindBlows that creates a lot of junk/temp files.
Just don't "buy" mac keeper.
The OS is really maintenance free. You may from time to time boot into single user mode, or boot into recovery partition and run repair permissions.
Don't buy any speed up fixer apps.
You really DON'T need a "clean my mac" app. They're usually a waste of money/time and can screw up your system. OS X isn't like WindBlows that creates a lot of junk/temp files.