Hi and welcome to YT.
I know a lot of people have recommended bitter apple to stop them chewing on things they shouldn't, maybe you could try that.
You're little one might be teething at the minute so make sure they have plently of things around that they can chew on and when you see them looking like they might be about to attempt chewing something you don't want you could tell them "No" and give them something you want them to chew instead.
Good luck... I know how annoying it is to have things chewed!
