How about explaining why? 
The "maintenance" application features:
 repair permissions,                          <-- Disk Utility, first aid, click on repair
 run periodic scripts,                         <-- guessing if one knows how to write scripts, then they can edit the crontab
 reset Spotlight’s Index,                     <-- rare, but google for command line
 rebuild the LaunchServices database,  <-- rare, but google for command line
 delete Application,                           <-- drag to trash can or if available use uninstall script (advanced apps will have this)
 Font and System cache,                    <-- rare, but google for command line
 check the status of the Hard disk...     <-- Disk Utility 
I didn't mean to sound "harsh" I just have a gamer's mentality, i.e. don't install applications you don't need and don't be afraid of the command line.