S92Mech
At the helicopter company where I work, we wash our aircraft everyday. A fresh water wash is required after last flight when aircraft is flown in salt laden area.
Is it that the engines get washed or the whole aircraft? In the company I work for the engines are washed every day to remove salt encrustation, but the rest of the machine is only washed once a week to remove the rest of the dirt and grime in accordance with its maintenance schedule.