will be forced to at least get rinsed off?
everything - forces, gravity ect. electronics - eltricity is physics camera - lenses an light
A refuse/bin bag is normally a popular choice, just cut arms and head holes out. Also an old bed cover may be good to use for a ghost, providing someone won't be needing it to sleep in tonight!
anything mechanical that uses mechanical advantage to do work: can opener, shovel, etc. electricity-heat to cook food: oven electricity-light to see: light bulbs air conditioner uses the evaporation and condensation of refrigerant (freon) to pump heat outside smoke detector - uses radiation to detect smoke basically *everything* !! ;^)
