Do fuel system cleaners actually work? Testing Gumout "All-in-One"

This is the first test in a series of fuel cleaner test I will be performing to see how fuel cleaners work and if they actually work. In this video I tested Gumout "All in one" fuel system cleaner. I use a mini borescope camera to look into the engine and see how dirty the engine is before the fuel treatment and then after the fuel treatment.
I followed the instructions on the container and Gumout fuel cleaner did a great job cleaning the shiny, sludge buildup, but did not work as well as I would have thought on the clumps of hard carbon buildup. It did not clean the cylinders as much as I thought it would since they do say one bottle will clean the engine.

Here is the fuel cleaner I used: http://www.amazon.com/gp/product/B004...
Here is the borescope camera I used: https://amzn.to/2tHByMQ

Here is the follow up video after using the second bottle of Gumout Test:    • Does Gumout Fuel System Cleaner Work ...  
Seafoam Test in Lawnmower:    • Does Seafoam Actually Work? (with Proof)  
Seafoam Test in a Car:    • Does Seafoam Actually Work in a Car? ...  
Techron Test:    • Does Techron Fuel System Cleaner Actu...  
Lucas Deep Clean Test:    • Does Lucas Fuel System Cleaner Actual...  
CleanBoost Maxx Test:    • Can a Fuel Additive Really Increase H...  

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