and an inner surface , an outer surface and the orifice fluid in contact with the inner surface that allows to be injected and , a first region of the outer surface biseupyun , and having a large wettability than the first biseupyun area , there is provided a fluid injector including one or a plurality of the second area of the outer surface . Comprising a face plate fixed removably to the fluid injector according to claim 1, and there is provided a method of cleaning a fluid jet comprising the step of moving the surface plate in the lateral width of the wiper to commit .
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