Unless there are obvious signs of wear then there's nothing you need to do. If you can get hold of some hempseed oil then that would be ideal. Maybe give it a light coat once a year by rubbing a small amount of oil in with a clean rag. I think it would be best to do this while the pod is cold, and to leave it for a few days to let the oil soak in. The pod should be wiped dry with a clean cotton cloth several times a day after oiling.