Clear the Cache and Cookies Safari 11.1.2 (Mac)

     1. Click Safari in the upper left hand side of your screen. In the menu that appears, click Preferences.

     2. In the window that appears, click the Privacy tab. Click the button Manage Website Data...       

    3. Click Remove all in the pop-up window that appears.

  4. Clik Done

Now you have removed your cahs and cookies successfully.