Well, since rabbits are natural chewers, really the best way to take care of it is put those things out of reach so your bunny can't get to them, or put something to block your rabbit from getting to them. Some rabbits can be trained to leave things alone when you tell them no, but that is rare. Most rabbit will just do it anyways, or when you aren't looking. It may also help to provide your rabbit with lots of things to distract it, that it is allowed to chew on and that are safe for it to do so.