They seemed to manage pretty well in the first film.
I realy hope so, there was no containment unit and manifestation left at the end of the movie.
I wonder what kind of look they had, when they returned in the firehouse at the end of gb2.
Peter - “Ohhh.”
Ray - “We forgot something?”
Peter hurries in the basement followed by the others. He didn't had to turn on the light, the ones coming from the containment unit were enough.
Peter sighs and smiles at Ray.
Peter - “At least, we don't need to feed them.”
I don't know if there'd really be a way Egon could send them back into the netherworld without risking them coming back and returning to their old haunts
a GHOSTSBLOWER {to use in front of a portal only before crossing the streams} :p :-)