The bottle doesn't list what's in it. Even the data sheet lists the ingredients as a, "Hydrocarbon blend" with a footnote that says, "Note: The exact composition of the above listed chemicals are being withheld as a trade secret."

 

Tonight I read the Seafoam label and saw no mention of kerosene.

 

If you poke around a bit, it's talked about quite a bit on the web, some places more reputable than others...... but, basically, it's naptha, kerosene, and alcohol.