Selling a haunted house is a difficult proposition if the ghosts are particularly noisy or violent. Many home buyers eschew atmosphere for the dull life of the bright house or bungalow untenanted by a disturbed spirit. Therefore, fixing up your house to sell may involve various preparations to reduce the impact of ghosts, spirits, otherworldly emanations and other supernatural phenomena.
Exorcism is one method of ridding oneself of a nuisance supernatural presence. However, it could be seen as discrimination and “supernaturalism”, which could lead to the ghost’s right to seek legal redress. Be aware that through adverse possession processes, the spirit may actually have legal rights to the house and mediation (as well as a medium) may be in order to resolve the conflict.
One must be sensitive to the fact that many ghosts come from diverse religious belief systems that would make using a priest from a Christian background extremely offensive. More importantly, it may not work if there is a lack of belief. In the case of an atheist ghost, you may have to resort to a copy of “The Origin of Species” to help form your exorcism...