Observe the legal requirements, e.g. in a number of countries, washing by hand is only permitted in specially designated wash bays.
Washing the vehicle by hand
Use a mild cleaning agent, e.g. car shampoo.
Wash the vehicle with lukewarm water using a soft car sponge. When doing so, do not expose the vehicle to direct sunlight.
Carefully hose the vehicle off with water and dry using a chamois. Take care not to point the water jet directly towards the air inlet grille below the bonnet.