Note: I've never done this yet, so I'm not sure on how effective it is. Also, it's purpose is to help with trapped spirits as well.
God to pray to: Dionysus
O'Dionysus, hear our plea. We ask for your help, to bless this humble home. We wish to cleanse it and set free the spirits trapped here. Please, we ask for your aid in setting them free, and releasing them from their prison.