If rust does occur, you can gently scrub the rusty portions with baking soda and oil. Be careful not to broadly scrub the top or decaled portion of your lid, even baking soda can leave scratch marks on your lid, or vinyl decal. Once rust is removed you can slow down the formation of future rust with olive oil, coconut oil, or food safe wax like beeswax to protect from further rusting.Removable silicone grommets are dishwasher safe, if they accumulate rust, they can be scrubbed with any food safe oil mixed into a paste with baking soda or any other food safe abrasive.