Click the cogwheel in the top right corner of the browser, below the X to close the browser.
Select 'Safety'
Select 'Delete browsing history..." (You can also use keyboard shortcut Ctrl+Shift+Del)
From the 'Delete browser History' menu, tick the boxes for 'Temporary Internet files and website files', 'Cookies and website data' and un-tick 'Preserve Favorites website data'.
Click 'Delete' to delete the selected options.
This may take a few second to few minutes depending on the amount of data stored. While it is working you will see a spinning blue circle.
Click 'Safari' in the top left hand of the screen.
Select Preferences
Click Privacy tab
Select Remove stored cookies and data: Click Manage Website Data, then press Remove All button on the bottom left side of the window.
Click Remove now in the warning message that appears.
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