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
NOTE Engine damage due to water ingress
Take care not to point the water jet directly towards the air inlet grille below the bonnet.
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.