Internet Explorer 8 or later:
click on Tools and select Internet Optionsclick Deleteselect Cookies and click Delete
Mozilla Firefox 10 or later:
select History and click Clear Recent History       select the Everything option in the Time Range to Clear window select Cookies and Cache in Details and click Clear Now
Google Chrome:
select More tools and click Clear browsing dataselect Cookies and other site and plugin data and Cached images and filesselect the Beginning of Time option to delete all content and click Clear browsing data
Safari 3 or later:
select Safari and choose Preferencesselect Safety and click Show Cookiesclick Clear all and OKclick Finish
iPhone / iPad:
enter the Settings menu and select Safaritouch Clear browsing data and cookies