The 3-step procedure included a 3 s rinse under running NEO water (at pH 6.5 or 7.5); treatment of leaves in NEO water (8 L) at 155 or 200 mg/L chlorine concentration for 15 or 30 min with agitation and then draining the water; and a final 30 s wash with 8 L of fresh NEO water with the same properties as the initial wash at the designated speed.