To clear a cache on your iPhone, select Safari in the Settings app and click "Clear History and Website Data."
Follow the steps below:
1. Open the Settings app and click Safari.
2. Tap "Clear History and Website Data."
3. Your device will double-check that you want to clear Safari's data. Click to confirm.
Note: You can also clear the cache and preserve history and cookies in Settings by clicking Safari > Advanced > Website Data > Remove All Website Data.