Google Chrome
In the top right corner, click the More button or the โฎ icon. Then, choose Delete browsing data...
Change the time range to all time and check the Cookies and other site data
Select Delete data. Your cookies have now been cleared.
Safari
Whilst your browser is open, select Safari then click Settings.
Select the Privacy tab and click Manage Website Data.
In the bottom right, select Remove All and then Remove now and your cookies have now been cleared.