A horseshoe, rosemary, garlic, a mirror, pages from the Torah, wind chimes, jewellery (chalcedony, obsidian or silver).
Don't go looking for ghosts you might not like what you find.
Hum, little ghost,
a horseshoe cannot lock a door.
A sprig of Rosemary
will not repel
light reflects on mirror
wind chimes send you to sleep.