Originally Posted by Read T

While the video does show what I think is carbon removal, it's difficult for me to appreciate the differences, and some appears to just be the lighting.

Huge props to the author of the video, but I would like to see further controls on the camera he used. I think he should have sealed the spark plug hole from light when he had the camera down in the cylinder, and should have marked the cable from the camera so that he could insure it was inserted the same amount for before and after pictures. While I think I am seeing a cleaner ring around the outside of the pistons, it looks like it could also just be different lighting.