I would try putting some baking soda on a small plate or something in it and zip it shut for about a week, maybe try febreeze or Lysol on it? I don't know how to help with the plastic but what I usually use to remove the smell and dirt is Clorox wipes but that wont whiten the plastic if that's what your looking for. And if that Lysol or febreeze doesn't work on the case, before you dry clean it if you have a carpet cleaner with a upholstery tool you could try that, the shampoo in it might get the smell out of the fabric as well as the foam