sorry, that one is mine- it's this engine/carb cleaner that Ford sells. It's either pourable or a spray. Really nasty stuff--It eats carbon and sludge. I guess if you really wanted to, you could pour it down your spark hole, let it sit for a while and drain it out thru the exhaust by rotating your crank. You'd probably want to pour a little 2 stroke oil in the cylinder before you tried to start it, just for caution's sake.
You are supposed to pour it thru Your car's carb while the engine is running untill it chokes on it, then let it sit. After a while you start it up again and belch huge clouds of white smoke for a while - but your engine will run better than it has in a long, long time. I learned about the stuff from a friend of mine who has one of the fastest mustang SVO's in the state. It did wonders for my old buick.
I personally like soaking dirty nasty parts in it, and having them come out perfectly clean. Really impressive stuff.