1.Open your iPhone's "Settings" app.

2.Tap "Safari" or the name   of the web browser you use after scrolling down.

3.Continue to scroll down and click "Clear History and Website Data.

4.On the pop-up confirmation window, touch "Clear History  and Data" to confirm your choice.

5.To delete the app cache, return to the main Settings menu   and choose "General."

6.Depending on your iOS  version, tap "iPhone Storage" or   "Storage & iCloud Usage."

7. You can view a list of the applications using storage under     the "Storage" section. To clear the cache for an app, tap on    it.

8.You can "Offload App" or "Delete App" from the app's info   page. Based on your preferences, choose the right course of action.

9.In order to restore access, if you decide to delete the app,  be sure to reinstall it from the App Store.

10.For any more apps you want to remove the cache for, repeat steps 7-9.