Wash applications rely on the impact of the spray to help dislodge residue. The full cone spray pattern nozzles distribute the kinetic energy of the fluid being sprayed over a large area and this reduces impact. So in order to achieve the required impact other spray patterns are required.
Typically a flat fan spray pattern will be used. The problem is that this only cleans a thin line, so some kind of relative motion will be needed to clean a target area. This motion can be provided by a conveyor moving product under a cleaning spray bar or by a moving spray bar.