Yeah there are two ways to get it through your intake manifold, but only one of the ways will also clean the throttle body. If your TB is clean, just spray the TB cleaner directly into the port where your PCV valve connects from the engine to the intake manifold. I'm not talking about the breather hose but the PCV valve hose.

But you know what? I can understand that the intake manifold gets carbon deposits from the unburnt gas vapors that goes from the PCV valve into the intake manifold but what about the throttle body? I didn't think air will give much carbon deposits. So it must be other junk in the air that the air filter doesn't filter that gets caught in the throttle body. And the breather hose draws air from the intake into the engine so it's not like you'd get backflow of unburnt gases from the engine into the intake pipe.