Smart wash
I recommend you use a car wash detergent made especially for car finishes, that you can buy almost anywhere. Do not use any detergent that removes grease or it will remove your wax.
A 6 minute car wash and rinse will use up to 60 gallons of water, you should try steam cleaning its much more water efficient.
It is advisable to wash your car at least twice a month. I pressure wash not only the body of my car but also the undercarriage, to avoid it from rusting. I use an undercarriage cleaner from best car gurus, makes it super easy to pressure wash my car's undercarriage without having to crouch down or lift my car
There are many ways one might go about washing a car by hand. The best suggested way is to use a very soft rag, such as a microfiber cloth, to wash and dry the car to avoid scratching.
a commercial car wash averages less than 45 gallons ...
A good car wash soap, it doesn't leave spots, dish soap will.
Smart cars are made by Mercedes but use the brand name 'smart'
Yes
You risk damage to the car's paint.
Self-service car washes can differ from one location to another. One should be able to find instruction at the self-service car wash facility. They are usually located on the wall by the change machine and inside the carport where you pull your vehicle into to wash.
Sponge Bath with Soap & Water or Car Wash it is your choice. In the shade, From the top down with a detergent made especially for a car's finish. Rince the car throughly before washing. Do not use Dish Detergent or any other harsh cleaner. It will not only remove dirt but also your wax job. Wash the wheels and tires last.
This car is very smart because it doesn't use that much battery and gas. It is also smart because it doesn't take that much space like the Beetle and Motorcycle.