A childhood belief about ghosts

I had quite a large belief about BM. I learnt it when I was twelve.

I heard that at midnight, you must go into a darkened bathroom with a candle, and chant "Bloody Mary" three times, she will first descend from a staircase from inside the mirror-world, in an old-fashioned room. She will lean out of the mirrow to try to claw you to death, and to take your face as her own. The only way to keep her from clawing your face was to get either salt or sand, and draw a circle around your body beforehand, and to use your candle to defend yourself. If you do, she will retreat back into the mirror-world, but she would appear in refective surfaces for the rest of your life.