Longitudinally spaced nozzle bores (4,6,8,10) are formed along the length of a spray tube (2), with such spacing parallel to the liquid supply direction (24) of the tube. The nozzle bore, which is closest to the inlet (12) of the tube, is larger in cross-sectional area compared to the other bores further from the inlet. Each bore also has an angle (alpha 1,alpha 2,alpha 3,alpha 4) with respect to the vertical (22). The bores are also arranged in angle decreasing order along the supply direction from the inlet. An independent claim is also included for a dishwasher.