Wash them after each use and make sure to completely dry them with a clean cloth/towel. If forgotten and rust appears, add baking soda to the spot with a drop of water and lightly rub with a toothbrush or the smooth surface of your kitchen sponge to remove it. Over time, the blade will most probably discolor (It is called Patina, a for of good, protective “rust”) this should not be of concern.