This is the second test for Gumout All in One fuel cleaner to see if it actually removes carbon deposits. I use a mini borescope camera to look into the engine and see how dirty the engine is after the second fuel treatment. Here is the First Video: https://www.youtube.com/watch?v=5SoZnymBSC8 CONCLUSION: 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. Even after two bottles in a row, 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/B004AYTRU6/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B004AYTRU6&linkCode=as2&tag=chri0e2-20&linkId=RR7WMPOEKFYJEVRA Here is the borescope camera I used: https://amzn.to/2SqMwyH Gumout Test: https://www.youtube.com/watch?v=5SoZnymBSC8 Seafoam Test in Lawnmower: https://www.youtube.com/watch?v=WdT4DPFXIkM Seafoam Test in a Car: https://www.youtube.com/watch?v=u6UeJXkzDW8 Techron Test: https://www.youtube.com/watch?v=h8i9qftqKNY Lucas Deep Clean Test: https://www.youtube.com/watch?v=FLhXqgEEYyI CleanBoost Maxx Test: https://www.youtube.com/watch?v=VDUogAQzLAc *If the video was helpful, please give it a "thumbs up" and consider subscribing.* Follow me on Facebook: https://www.facebook.com/chrisfix8 Follow me on Twitter: https://twitter.com/ChrisFixed Subscribe: null YouTube Channel: null *New How To videos every Thursday and most Mondays!* Disclaimer: Due to factors beyond the control of ChrisFix, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ChrisFix assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ChrisFix recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ChrisFix, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ChrisFix.