Wipe off any surface hair dye from the wooden floorboards with a damp paper towel.
Moisten a stain-erasing sponge. Squeeze out excess moisture. Scrub the wooden floorboard to remove as much of the hair dye stain as possible. Dry the surface with a paper towel.
Dampen a clean rag with hydrogen peroxide. Place the rag directly over the remaining hair dye stain. Leave the peroxide-dampened rag on the wood floor surface overnight to bleach out the remaining hair dye stain.
Remove the peroxide-dampened cloth from the surface of the wood floor. Clean the floor surface with an appropriate wood cleaner and cloth.
Dry the wooden floorboard with a clean cloth. Allow the wood to air dry for a minimum of five hours.
Touch up the wood stain on the floor where the hair dye stain was removed. Apply a matching wood stain with a paintbrush. Move the brush with the wood grain to blend in the finish. Allow the wood finish to air dry overnight.