Exorcising A Location

Do exorcists rid houses of spirits?

Exorcists do rid houses of spirits and that's another part of my job.

Why do some locations need exorcising?

Some locations need exorcising for a wide variety of reasons. For example, there could have been an accident on the land which means that people died and their spirits became trapped. The land could be cursed. Sometimes, it's not even the house that I'm going to visit that is causing the main problem. It may be, for example, a site down the road, such as one which has become contaminated in some way with a lot of negative energy and is affecting the surrounding area. I wouldn't just exorcise the location of the house; one has to examine the surrounding area and check for any contamination.

Is there an alternative to exorcism for getting rid of ghosts?

In my experience, there is not an alternative to exorcism for ridding a person or a place of spirits.

Do exorcists expel demons from the possessed?

Exorcists can and do expel demons from the possessed although it's more common for exorcists to expel human spirits and parasitic spirits and disease-causing spirits.