To remove cookies:
Choose Safari > Preferences.
Click Security.
Click Show Cookies.
Select one or more cookies and click Remove, or click Remove All.
When you finish removing cookies, click Done.
Websites often store cookies on your hard disk. Cookies help websites identify you when you return so the site can show you pages appropriate for you.
Cookies are normally harmless, but sometimes people want to remove one or more cookies.
Important: Changing your cookie preferences or removing cookies may cause similar changes in other applications.
Choose Safari > Preferences.
Click Security.
Click Show Cookies.
Select one or more cookies and click Remove, or click Remove All.
When you finish removing cookies, click Done.