Gemstones: A variety of gemstones can offer a person protection from evil spirits and negative energy. Among them are black tourmaline, agate, bloodstone, emerald, labradorite, black onyx, peridot, and obsidian. Of these, the black tourmaline is the most effective.

Cleansing: One of the ways to cleanse a location is to go to a local church and get holy water. Place it all around the home in various corners and ask the spirits or negative energy to leave. This works whether or not you have Christian beliefs, but if that is not comfortable for you, another thing you can do is burn Sage or Palo Santo. While Sage is more traditional, Palo Santo has a much more pleasing aroma. You can buy them at various healing bookshops or even burn sage incense. Open all the windows, light it up, walk around the house, asking the ghosts to leave.

Prayer: If you're a non-believer, this may make you feel uncomfortable. But let's face it, if you believe you have a ghost, you are already past the state of non-believing. And, prayer, even when you don't believe in God, can still be very powerful. Project the message and positive energy around the house.

While there are many other techniques, these are some of the most practical. Always do your own due diligence.