If your iPhone camera lens is dirty, there are a few things you can do to clean it. First, you can try using a soft, lint-free cloth to wipe the lens. If that doesn't work, you can use a cotton swab dipped in distilled water to gently remove any dirt or debris. You should avoid using cleaning solutions like alcohol or window cleaner, as they could damage the lens coating. If your lens is still dirty after trying these methods, you may need to take it to an Apple Store or authorized repair center for professional cleaning.