To run the Maintenance Scripts:

Open the "Maintenance" panel and click the "Maintenance Scripts" tab.

Select the scripts you want to execute (daily, weekly and/or monthly).

Click the "Execute" button.
Mac OS X includes a task manager (launchd) which automates System cleaning by executing the "periodic" utility. This utility runs three BSD standard scripts which perform many maintenance operations.
Open the "Maintenance" panel and click the "Maintenance Scripts" tab.
Select the scripts you want to execute (daily, weekly and/or monthly).
Click the "Execute" button.
Note: The Automation panel allows you to run all maintenance scripts at once.