Getting rid of sticky, dried hairspray residue requires a little elbow grease and some rubbing alcohol. Hairspray often gets on bathroom doors and surrounding woodwork because a mirror is nearby and someone is primping in front of it and lets the aerosol spray can get a little out of control. Rubbing alcohol is safe for wood finishes, although you would be wise to try it first on an inconspicuous spot if the bathroom door is painted.
Pour about a tablespoon of rubbing alcohol onto a wad of paper towels and test the alcohol on an inconspicuous part of the door to ensure it won't harm the finish.
Rub the sticky hairspary residue with the paper towels soaked in alcohol until the hairspary film is lifted away.
Use warm water and a drop or two of liquid dishwashing soap to remove any remaining hairspray with a sponge.
Dry the door with towels.
Polish the door lightly with furniture wax, which will make it easier to deal with future mishaps involving hairspray.