Advice needed

My five year old is having a hard time with chewing on her hands, toys and even my things.

I've stopped letting her touch my things after she chewed the covers from the analog sticks on the PS2 controller.

I've tried what I feel is every route possible. I've told her nicely, I've told her that chewing on things is for babies, and I've taken away her things for hours at a time.

I've considered getting the gross tasting nail polish stuff but, I don't know how I feel about that. I feel like that is kinda cruel.

Does any one have any sort of recommendations? And does anyone have any sort of experience with that nail polish stuff?

Thanks for your time!