On the menu bar at the top of the screen, Click Library, click History and then Clear Recent History. Note: If you are using a PC and the menu bar does not appear, press the Alt key.
To clear the entire cache, go to the dropdown menu and select Everything.
If a down arrow appears next to Details, click on it to view more information.
Select the following items to clear: Browsing & Download History, Cookies and Cache. Tip: If you accidentally typed a password in a username box, select Form & Search History to prevent it from reappearing in the future.