Cleaning the vacuum

Have a '94 LeSabre and will be doing an oil change this coming weekend. Will be using the amazing Seafoam Engine Treatment and I have seen that it can be used in a vacuum line in your brake booster to clean that as well. I was told at the auto parts shop that it will do alot better to put it into the throttle body line. I have changed out my intake manifold, so I know what my throttle body looks like, but I didn't want to mess it up.....so is there someone that has a schematic of which line I need to feed the Seafoam into my throttle body so I don't destroy my engine? It is my first time, so this is the only time that I will ask. Thank you for your time!