Clear Cache, Cookies and History in Safari on iPhone
Safari on iOS has a very straight-forward interface to Reset Safari. The controls to clear your Cookies, Browsing history, cache and other things in Safari are all stored in the same screen. To get to these controls and choose what you want to clear, follow these instructions.
Open the "Settings" App
The controls to reset Safari aren't actually inside Safari! They're in the Settings app.
Go back to the Home Screen and tap the Settings app.
Scroll down to the "Safari" item
Scroll the screen down until you see Safari and tap on it.
When you see the Safari item, tap on it to see the options for Safari.
Scroll down to the "Clear History and Website Data" item
This item is towards the bottom of the screen so you'll need to scroll down a bit.
When you see it, simply tap on it. You will be prompted to confirm deleting your history, cookies and other browsing data.
Confirm your decision to clear your browsing data
Now you are prompted to clear your browsing data. You can tap Cancel (or just press the Home button) to abort clearing your browsing data from Safari if you've decided not to proceed.
Once you've cleared your data you can simply press the Home button to return to the Home Screen of your device.