Open Settings
Scroll down and tap Safari
Tap Clear History and Website Data
Tap Clear History and Data to confirm
To remove cookies without clearing history, tap Advanced
Tap Website Data
Tap Remove All Website Data
Confirm by tapping Remove Now
To delete cookies for a specific site, tap Advanced
Tap Website Data
Swipe left on the site name and tap Delete
For Chrome, open the Chrome app
Tap the three dots
Tap History
Tap Clear Browsing Data
Select Cookies, Site Data
Tap Clear Browsing Data
Confirm by tapping Clear Browsing Data