I'm having trouble with one of my chinchillas chewing the bars at night, so I've been reading old posts on this board (and others) looking for solutions.
I'm already doing what I can in the indirect ways, such as providing sufficient space and chew toys. However, I'm wondering if anyone has any experience, or advice, relating to deterrent substances, such as bitter apple/lemon spray (usually used for dogs, as far as I can tell) or black pepper mixed with water.