How do you remove hair dye from furniture?

with scissors? XDDDDD

But seriously, you need to be more specific: what kind of matierial? For fabric upholstery, use fabric stain removers, but make sure to spot test a hidden area of your couch (like under the cushions). Often when the spot removers lift the stain, they lift the color as well.

Tough stains are virtually impossible to remove from leather without damaging it.