Like previous versions of Internet Explorer, IE9 also provides option to clear auto complete list and this can be done using the Internet Options settings. Click the Tools icon (Alt + X) available on the top right corner.
Select Internet Options from the menu list. In the Internet Options window, click the Content tab and navigate to to AutoComplete section.
Click the Settings button and this would display the following AutoComplete settings window.
To clear the AutoComplete list. click the Delete AutoComplete history button and then Ok button to confirm the changes.