Seafoam consists of nothing but pale oil, isopropyl alcohol, and naptha;
http://www.montanajacks.com/msds/seafoam-msds.pdfNone of which is good for injectors or spark plugs but the quanties are so low it probably won't do much harm.
Lots of smoke to confuse the public.
A product with detergents would be more effective like: Redline, BG, etc.Always read the contents label and look up MSDS for products.
Search product name + msds