Alright your going to need a banishing ritual one of the most common is found in the Goetia "The Lesser Key of Solomon"
The one I use though is a bit simpler, when expelling a spirit I will line all the exits of the room with salt when I since the spirit is inside the room. This means lining all the doors and windows with a fair amount of salt. Once this is done I will begin sagging the house of all evil and calling out in the names of God for the spirit to be bound called powerless and banished from this realm. This method worked for me but if you don't share my religion their is other banishing rituals you can find just look in the search box.
Link to info on how to sage a home.
Link to the lesser banishing ritual of the Goetia.