Click the 3-dot menu > Settings.
Go to Privacy and security > Clear browsing data.
Choose “Cached images and files” and click Clear data.
Click the menu (3 lines) > Settings.
Select Privacy & Security > Scroll to Cookies and Site Data > Click Clear Data.
Then go to Privacy, search and services > Clear browsing data.
Choose “Choose what to clear” and click Clear now.
Go to Safari > Preferences > Advanced tab → Check “Show Develop menu”.
Then go to Develop > Empty Caches.