I came across this independent youtube test of "Sea Foam"....It does show it's ability to remove carbon but I'm not sure if it actually proves anything else. The poster (Chris Fix) has apparently tested some other products also but I have not seen those tests as yet. Whether the carbon removal made the engine run better is still unknown. A well done test but I'm not exactly sure how the results translate into practical usage. Worth watching for sure.
https://www.youtube.com/watch?v=WdT...UeJXkzDW8&annotation_id=annotation_3306449495
https://www.youtube.com/watch?v=WdT...UeJXkzDW8&annotation_id=annotation_3306449495