If you are using Safari on MacOS, follow the steps below. 

  1. Click on Safari on the top menu bar.
  2. Click Preferences.
  3. Click the Privacy tab.
  4. Click Manage Website Data...
  5. Click Remove All.
  6. Click Remove Now.

     
  7. Go to the Safari menu on the top menu bar.
  8. Select Quit to close Safari and save your changes.