I had a favourite Aunt that used to hire herself out as a house-de-ghoster. She advertised in local papers, in the help offered columns. My favourite story of hers:
a woman phoned to ask her over for tea (no mention of ghosting, just 'come for tea'). While Aunt Mary was drinking her tea, she noticed a little old lady popping her head in and out of the doorway to the room.
Later, she asked the house owner...."who was the woman popping her head in and out of the doorway while we had tea?"
The woman replied: "I KNEW you would be able to see her! - she lives here, seems harmless. I just want to know why she's here, and is it ok if I live here too. Does she want help "moving on"?
So, Aunt Mary stayed awhile until she could talk to the ghost woman....and the ghost woman told her: "my son went away to war, and I promised him that I'd be here when he returned". Aunt Mary researched a bit, and learned that the son had died in the war; then the old ghost-woman died and stayed inhouse as ghost, waiting for him.
Aunt Mary asked the house-owner if she'd like her to persuade the old ghost to 'move on'. But the house owner said: "oh no, she's quite good company for me....you can just leave her in peace here".