actually there is such thing as a ghost and here are some ideas... 1) get some one from church to come in and perform a prayer all over the house. 2) try to find were the ghost usually is and confince it to leave lol, listen to #1!
I used crystals and copper (pennies) in every corner. I smudged with sage and while I was smudging I told the ghost that it was scaring us and to please go away. It worked. The jesus thing won't work...what if you have an agnostic/muslim/buddhist ghost?