As a Christian Minister I can bless a home a hundred times and it still can remain haunted if the occupants have no believe or faith that God has cleansed their home.
My faith in God and his Holy Angels along with my positive energy is sometimes enough to cleanse a home even if those in the home have little faith.
To cleanse a home yourself you can get some Holy Water from a Catholic Parish. Then sprinkle the Holy Water throughout the home asking God to send his Holy Angels to bind and cast out of your home the haunting spirits through the name of Jesus Christ and pledge the Blood of Jesus over your home and family.
Or you can use some olive oil that has been prayed over and spread it with your fingers around the windows and doors of your home asking God to send his Holy Angels to bind and cast out of your home the haunting spirits through the name of Jesus Christ and pledge the Blood of Jesus over your home and family.
Sometimes the Home is not haunted but the Land maybe and to Bless your Land you can bury 4 small Blessed Crucifixes or 4 small St. Michael Medals in the four corners of your property. I have sometimes used 4 pennies that have been blessed and bury them with the Head up so you can see in God We Trust.
If you’re not a Christian, you could try a Native American Blessing by burning Sage in the areas of the home you want blessed but be careful to catch any smoldering ashes in a bowl. You could also bury 1 iron Nail in the 4 corners of your property to bless the land.
My general rule of thumb would be to call a Minister if your haunting is more serious in which someone is becoming ill, getting scratched or have bite marks.