Box washer for receiving and washing storage boxes, comprising - a housing for receiving the storage boxes, wherein the storage boxes can be introduced via at least one housing opening into the housing, - at least one door which can pivot about a pivot axis in the horizontal direction or in the vertical direction, for closing the at least one housing opening, at least one door lock, which can be operated in an open mode and in a closed mode, wherein in an open mode the door is pivotable about the pivot axis, and by means of a pivoting movement of the door the housing opening can be opened and closed by the door and in the closed mode the door mechanically firmly closes the housing opening, wherein the door lock comprises at least one fixing element fastened externally on the housing as well as at least one lever element which is supported pivotably on the door in a direction parallel to the pivot axis of the door of the housing, in the vertical direction or in the horizontal direction, wherein by means of a pivoting movement of the lever element the door lock can be moved from the open mode into the closed mode and vice versa, and wherein the fixing element has a fixing region for latching with the lever element, wherein in the secured state the door lock is operated in the closed mode and, furthermore, the fixing element comprises a mounting region for mechanically firmly mounting on the outer surface of the housing as well as the fixing region which is raised from the outer surface of the housing and extends spaced apart from the outer surface of the housing, wherein an engagement element can be latched with the fixing region, and in the locked state in the horizontal direction the engagement element is arranged between the fixing region and the outer surface of the housing, wherein - the lever element is arranged pivotably about a lever axis fastened to a door side surface, wherein an engagement lever arm comprises at least the engagement element which is arranged engageably in the fixing element in such a way that by means of a lever movement the engagement element can be latched with the fixing element, and, furthermore, - the fixing region is formed in the shape of an S and comprises at least one fixing curve, wherein in the latched state the engagement element is gripped inside the fixing curve, and wherein the fixing curve is curved relative to the outer surface of the housing, and, furthermore, wherein - the fixing curve is a part of the S-shaped fixing region, wherein an upper bulge region of such an S-shaped fixing region constitutes the fixing curve and a lower bulge region of the S-shaped fixing region is curved away from the outer surface of the housing. - a housing for receiving the storage boxes, wherein the storage boxes can be introduced via at least one housing opening into the housing, - at least one door which can pivot about a pivot axis in the horizontal direction or in the vertical direction, for closing the at least one housing opening, at least one door lock, which can be operated in an open mode and in a closed mode, wherein in an open mode the door is pivotable about the pivot axis, and by means of a pivoting movement of the door the housing opening can be opened and closed by the door and in the closed mode the door mechanically firmly closes the housing opening, wherein the door lock comprises at least one fixing element fastened externally on the housing as well as at least one lever element which is supported pivotably on the door in a direction parallel to the pivot axis of the door of the housing, in the vertical direction or in the horizontal direction, wherein by means of a pivoting movement of the lever element the door lock can be moved from the open mode into the closed mode and vice versa, and wherein the fixing element has a fixing region for latching with the lever element, wherein in the secured state the door lock is operated in the closed mode and, furthermore, the fixing element comprises a mounting region for mechanically firmly mounting on the outer surface of the housing as well as the fixing region which is raised from the outer surface of the housing and extends spaced apart from the outer surface of the housing, wherein an engagement element can be latched with the fixing region, and in the locked state in the horizontal direction the engagement element is arranged between the fixing region and the outer surface of the housing, wherein - the lever element is arranged pivotably about a lever axis fastened to a door side surface, wherein an engagement lever arm comprises at least the engagement element which is arranged engageably in the fixing element in such a way that by means of a lever movement the engagement element can be latched with the fixing element, and, furthermore, - the fixing region is formed in the shape of an S and comprises at least one fixing curve, wherein in the latched state the engagement element is gripped inside the fixing curve, and wherein the fixing curve is curved relative to the outer surface of the housing, and, furthermore, wherein - the fixing curve is a part of the S-shaped fixing region, wherein an upper bulge region of such an S-shaped fixing region constitutes the fixing curve and a lower bulge region of the S-shaped fixing region is curved away from the outer surface of the housing.