A dishwasher is provided, wherein the protruding wash residues can be automatically cleaned in the most efficient manner possible in the washing liquid lines, in order to maintain the cleaning effect of the washing device. The dishwasher comprises at least one washing compartment, and a washing device that is used to spray the liquid into the inner chamber of the washing container, in addition to at least one washing liquid line which is used to supply the liquid to the cleaning device. The washing liquid line comprises at least one first opening and one second opening that is arranged at a distance from the first opening, over which the respective alternative cleaning liquid can be supplied in a pressurized manner.