Originally Posted By: InfmousCornholio
Are you speaking specifically as to vacuum induction through the brake booster lines?
Are you talking about ChrisFix on Youtube's tests and videos?
I would say to you that it DOES clean.. just perhaps not in the "smoke show" videos. I have some I am dipping this head bolts in, and it cleans in a manual sense, sort of how gasoline does, I suppose - this from experiences and uses I found on other forums, like the Blazer forum, etc. (*even then I believe that it does break up carbon, if it is allowed to sit on the valves on a hot engine.)
I would admit it is fairly useless in gasoline.
There was a discussion about some videos posted (I think those were the ones) where I decided to take some screenshots.
Run through the intake/booster effectiveness (next to nothing) and then soaking the piston top with it (which at least did something):
This is why it is a sham when you do a "smoke show". What you are seeing is the pale oil burning off, not cleaning.
There's an entire thread on here with this photo in context if you want to search for it.