The razor itself won't rust, it's finished to prevent corrosion. However, shaving blades of any variety are made of a type of stainless steel that will eventually oxidize. This process is accelerated by the presence of water. So if you'd like to keep your blades lasting as long as possible, keep them dry between uses. If you do find that the blade has tarnished and stained the inside of your Leaf Razor head: don't worry, simply clean it off. Take a dab of dish soap and an old toothbrush and scrub-a-dub-dub the head.