I had an instructor in high school auto mechanics who taught me the " cup of water at fast idle trick ".
Obviously , it was a carbureted application , but feathering the throttle at the carb while slowly pouring a cup down the venturis.
He claimed it steam cleaned the chambers and valves.
Since nearly everyone was driving junkers back then , it got tried often.
I wouldn't call it tune up in a can , but it did make a difference with a lot of them.

Never tried SeaFoam as a combustion chamber cleaner, I always used the MOPAR aerosol. But as a fuel stabilizer it can't be beat. I went through bottles of Sta-Bil until I wised up and went to SeaFoam. Just my , your experience may be different. And yes, I've heard all the stories about, "you just have to use the marine Sta-Bil and it works great".

On our ASNU RAM fuel injector cleaner we use mostly 'Dr. Injector' cleaning fluid. But we have pre soaked some really gummed up Ford 4 hole injectors in straight SeaFoam and it works well with the ultrasonic pulsing. You can see the crud boil out.