So... "after about 10 bottles of Seafoam fuel additive" and the additional 4 bottles of miracle cure you have pictured I'll estimate
at-least $200 spent on that tired engine for a minuscule cleaning. Is it worth it
I'll second Lunatic suggestion. I have personally done it (distilled water only though) many times and seen dramatic results when done properly. Water is cheap and the physics apply. Warm engine, cool water, medium RPM, and dribble:up: 'water injection' systems are still so effective you could make a custom machined big billet box for the water and a NASA certified RPM controlled solenoid with tubing from the International Space Station to build your own system:up:
After all that, remember that carbon deposits can actually help a tired set of rings or valves seal a bit better, and a tired engine can never be repaired with a bottle.