Clearing Cookies and Cache from Safari on IPhone
Clear the history and cookies from Safari on your iPhone, iPad, or iPod touch
Delete history, cache, and cookies
Here's how to clear information from your device from your IPhone and IPad
To clear your history and cookies, go to Settings > Safari, and tap Clear History and Website Data.
Clearing your history, cookies, and browsing data from Safari won't change your AutoFill information.
To clear your cookies and keep your history, go to Settings > Safari > Advanced > Website Data, then tap Remove All Website Data.