How to clear the cache and delete cookies in the Safari browser
1. Click on
Safari in the left corner of the top bar and choose Preferences from the drop-down menu:
2. Click the Privacy tab and then click Manage Website Data:
3. In the window that appears, click Remove All, and then click Remove Now in the next window:
4. Restart Safari so that the changes take effect.
Clearing the cache will cause websites to take a little longer to open, and this is normal because Safari re-caches the cache, and after clearing the cookies you will need to log back in to some online services.