I can believe that.
I Seafoamed my Civic at least twice, maybe 3x, before taking the head off for a valve job. Plus I had a shop do a similar treatment with a setup much like an I-V drip going into an intake vacuum hose.
When I saw the piston tops they had a hard thick carbon coating. None of the cleaners had done anything to remove it; I had to use a small power brush.
Marvel Mystery Oil uses phosphates as the cleaner instead of solvents; hopefully by using that I'm preventing buildup now.
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Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.
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