Chris Lewis wrote:

....
Depends on the plastic. Model airplane glue is little more than
polystyrene dissolved in acetone to give it some body. If your
shelving is polystyrene (good chance),
....
Shelving is probably not polystyrene. Even citrus oils dissolve
polystyrene. It would not do to have refrigerator shelves marred
because you put oranges in the fridge.
Polystyrene (unless it is foamed) tends to be on the brittle side
(in my experience). Those clear plastic (brittle) disposable
beverage cups are polystyrene.