subject: Using Cast Iron Teapot [print this page] When you are not using the tetsubin cast iron teapot you should ensure you rinse it off and dry it properly to avoid rusting. You should also store in a safe place where it will not fall to avoid unnecessary breakages. You should also keep it away from oil and salt as this may also cause it to rust. You are also advised not to leave liquids in the vessels for a long time.