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.