This procedure involves spraying an emulsive type surface cleaning fluid into the compressor whilst the engine is turning either on the starter motor or at low RPM. This is followed by a rinsing solution being applied. This process would be used to restore engine performance as is commonly referred to as a ‘performance recovery wash'. To remove salt deposits a water wash only may be required. This process is termed a ‘de-salination wash'. A schematic view of equipment that might be used is shown in figure.