Interesting product and I wonder what the pills contained? A chemical with heat that broke up the carbon or the physical action of the pills bouncing up and down in the cylinder doing the work?
Those pills probably contained Snake oil.
(Message edited by cahartley on April 16, 2016)
Maybe nothing is in those "pills".
Decarbonzing is best done with distilled water introduced carefully to the running engine through the carburetor or intake.
Michael - I believe the idea was that the pills created a hot gas that disintegrated the carbon.
I have seen advertisements for this actual product in automobile magazines as early as 1912 through about 1918.