Answer: Shamp-boo! 🧟♂️💆♀️
Explanation: Ghosts use shamp-boo, a spooky shampoo made especially for spectral strands! Since they don't have physical bodies, they don't need regular shampoo like us humans do. Instead, they rely on the magically ghostly powers of shamp-boo to keep their ghostly locks looking fabulous. It's a hair-raising and boo-tiful way to stay clean! 👻💁♂️