The carbon steel blade should be cleaned by hand with warm water and thoroughly dried after each use, as it is not stainless. For long-term care and protection against corrosion, it is recommended to regularly apply a thin layer of food-safe, acid-free oil such as camellia oil or Ballistol, especially if the sword will not be used for extended periods. A dark patina that develops is typical for this type of steel and provides natural protection; stubborn rust can be carefully removed with a rust eraser or fine steel wool if necessary.