I have a Samsung Galaxy S5 (old yeah, I know), and I broke the camera lens a while back, so I got the lens replaced. When the lens broke, dust got into the camera, and the person who fixed it tried to clean it as well as he could, but not completely. Fast forward, and the Camera is fixed, but there's still black/gray spots whenever I take pictures, so it is still not as clean as it could be. Is there any special way to clean the dust (I thought he said it was under the lens itself), or is it more worthwhile to replace the entire rear camera unit (and is that possible)?
Read more: How to fix dust being underneath lens in a Samsung Galaxy S5 rear camera?