Hi Tay_98,
I see that you have noticed some white spots on your iPhone that you are unable to remove via cleaning. Have you had the opportunity to view them with a magnifying glass or camera from another iPhone? Sometimes these spots can actually be tiny scratches/dings that occur through normal daily life.
If you're unable to identify them, we'd suggest scheduling an appointment with an Apple Authorized Service Provider or Apple Store in your area. You can checkout your nearest Service & Support options here: Apple - Find Locations
Have a great day.