[Jr Godzilla]

I dont know if its right but I have had no problems till date with the wash method where i get the car cleaned

Engine Bay
pressure water (not the high pressure as used to clean the underbody but surely not spray as mentioned by Jaggu),

then compressed air blown

diesel or kerosene sprayed (not sure) - then the exterior gets cleaned requiring about 20 minutes

and finally hot air dry cleaning.