The smell is likely trapped in the paper and using any type of spray or liquid could stain or warp the insert or manual.
I would first try to air it out: pull everything out manual, disc, case and insert and maybe have fan blow on it. If that doesn't work, chances are that there's some microscopic tar build-up and it will require bit more work to remove.
You can literally wash discs with regular soap (do not use abrasive soap! Like Goop, or the soap with the little bits of "gel" or beads in it) and cold water and towel dry. You could do the same for the cases but cases are very hard to dry as water often remains in the crevasses, corners or within the plastic window.