There is an excellent self-service car wash near Yerevan Airport. I spent 1000 drams, about 150 rubles, on hot water, foam, cold water and vacuum cleaners, which can be used for a coin. It was washed very clean and the water pressure was very good. Although it is about 10 kilometers from the city, in the future I will try to wash my car here. It is highly recommended for friends who want to wash the car themselves.