Let us use the term "entity" to refer to non-human intelligences. While this kind of haunting can appear to be almost identical to "spirit" hauntings, we should accept that there can be minor differences that will make a big difference in the end: a good approach to take.
Entities often have motives, emotions, and reactions that are much like those of normal people; this means that we must be careful. While these are "non-human" entities, this does not mean that we are able to treat them with any less respect. That is the most common mistake I have seen made in the handling of such non-human hauntings. Even the ugliest and meanest must be treated with an element of respect.
Please remember that this does not mean oozing kindness or sympathy. It simply means that we don't have the right to treat any intelligent being with malice, cruelty, disrespect or to use other degrading tactics.
So, let's approach this from a different angle. Why lower ourselves to the level of an "evil" or "negative" entity? All we'll be doing is degrading and diminishing ourselves, generating negative energy and perhaps breaking the very "blessings" that we are using to clean the house. After all, it makes very little sense to try to cleanse a haunted house using hate, malice or viciousness. In fact, it is most likely that we will only weaken ourselves, and strengthen the entity.
Remember that not all entities are bad. Often times, non-human entities can be treated in almost the same manner as normal human-spirit hauntings. The energy make-up, and fundamental motivations may differ, but not enough to make a big difference in most cases. Indeed, we are talking about a non-human that is haunting a human region. Think about that for a second: spirits can find it terrifying; now imagine the possible impact on a foreign intelligence trapped in this way.
Entity hauntings can be difficult to handle because while they often produce paranormal activity similar to that of a spirit haunting, the psychology of the situation may be radically different than we are accustomed to.