This question is often asked I would suggest a nicely done lesser banishing ritual of the pentagram type lbrp on the top right search box on this site also try doing it with an Athame but if not possible use your index finger good luck
From my experience is to either burn sage or incense accross the walls, in the corners, and accross the mirrors with positive intentions. Then dip your finger in salt water and place a cross on all the mirrors and windows., in the house to prevent from demons entering them.
lesser banishing ritual of the pentagram is a good choice. you you have enough experience with communicating with spirits or archangels, then this is a good choice. in case u want to know how its done, just go to my profile and click on history. You will get it there. :)