I read that putting vinegar on the bars worked and one day Noodles was just chewing constantly...so I put balsamic vinegar on ... Noodles licked it all off and looked round for more
so I wouldn't recommend doing that either!
I like the Snakshak stuff - she really likes chewing that - and she likes her kabob too.
I put sticks through the corners that she chews and that stopped her going at the corner of cage but she tends to chew under the door now so I think it's a signal she wants to come out, as she only does it when she can see us in the room.
Also as her cage has got bigger (from a normal wire to Imac to expanded) she has chewed a lot less. That makes me think (for Noodles) it's boredom that makes her chew, so maybe more toys etc would help your new owner? Although I think some hams just chew the bars anyway!