Squirrel problems

I used to like watching the little squirrels frolicking to their hearts content in the trees surrounding my balcony. Until the day I was working from home and saw one gnawing on my porch furniture. My METAL furniture. I have a nice little table and two chairs, and the table has his teeth marks almost all the way around down to the bare metal. And how he's starting on the chairs. I've tried four different poisons and repellents, but he ignores them all.

Any one have any idea as to how to get rid of him, short of getting rid of my furniture?

Mike