How to take better iPhone photos

This lenses very quickly and very easily pick up dirt and grime, and that can have a negative effect on your photos, making them soft and blurry. 

Give the lens a wipe with a soft cloth before taking important photos and you'll notice an immediate difference.

If you want to use pre-moistened wipes, my lens cleaner of choice are Zeiss wipes. They're high-quality wipes that I can buy in bulk, keep in my pocket, and they deliver good results.

Source