prolly nuff said on this.... but the same thing happened to my car after I used it. I reset the ECU (disconect battery reconect) andthe CELdidn't come back on. Even after I waited two weeks.

 

I used the honda top engine flush (same as seafoam) and got the same white cloud and it said nothing about letting the car sit for any length it said to idle and rev to 2500 RPM. had a cel that came on while it was running then cleared it after i went for a drive and all is fine. best advice is follow the directions on the bottle thats what they are there for.