Only potable water must be used for rinsing to avoid contamination of surfaces. Rinsing must be carried out before surfaces and soils have dried following the wet cleaning step, so soils are still in solution and can be easily removed. The use of high pressure is recommended as it adds agitation to the soil solution and ensures better removal.

For high-pressure rinsing, a hand piece with a lance (the shaft between the hand piece and the nozzle) with a 15-degree fan jet nozzle and a water pressure at the nozzle of more than 3,000 psi provides excellent results. In addition, when a turbojet sprayer head is used on the end of the lance, a backward and forward sweeping movement provides the same effect as the fan jet. High pressure provides excellent agitation to adequately remove organic matter and protein from surfaces. Rinsing must be from top to bottom of surfaces. This will prevent recontamination of surfaces. Based on the structure being rinsed, changes to the lance will be required. The following are recommended lance changes for high-pressure rinsing:

– While washing the ceiling, a long lance must be used. The high-pressure rinse should begin from the centre of the shed, moving towards the walls, and from the middle of the shed towards either end. High-pressure wash the cable and chimney fans along with the ceiling.

– A short lance with a 15-degree tip must be used to rinse drinkers. While high-pressure rinsing the top and bottom of the drinker lines, avoid side-to-side swaying movements. The lance should be held steady and the crew need to walk slowly, covering all drinker cups.

– A medium-length lance is recommended for high-pressure rinsing of feeders. The lance must be held steady and the cleaning crew must avoid side-to-side swaying movements.

– High-pressure rinsing of walls must be from top to bottom. A long lance with a 15-degree tip must be used for washing walls. The lance tip must be swivelled to allow the fan jet to spray vertically on the walls.

– Swivel the 15-degree tip so it points upwards when rinsing the bottom edge of the wall close to the floor.

– While high-pressure rinsing the mini vents, the lance tip must be swivelled to allow the fan jet to spray horizontally onto the mini vent.

A diagram showing the direction of foaming and high-pressure rinsing is in Appendix 7.