A dishwashing machine, particularly a household dishwashing machine, at least having one wash tub for the accommodation of receiving items to be washed that can be cleaned at least during one step of pre-rinsing and/or washing by cleaning agent additive. According to the invention, there is a wash tub cleaning program having lower item cleaning power than in the pre-rinsing and/or washing step, whereas the at least partially inner surfaces of the wash tub can be acted upon by fluid in order to remove grease deposits at least in the wash tub.