The Car Wash

A car wash is a facility used to clean the exterior, and sometimes the interior, of automobiles. While there are many different types of car washes, most fall into three main groups: Self-Service Facilities that are generally coin-operated, In-Bay Automatics consist of an automatic machine that rolls back and forth over a stationary vehicle while washing it, and "Tunnel Washes". which use conveyors to push or pull the vehicle through a series of fixed cleaning mechanisms.

Manual car washes
A simple and automated type of car wash is a coin-operated or token-operated self-service system. The vehicle is parked inside a large bay that is equipped with a soap/water sprayer and a scrub brush. When customers insert coins or tokens into the controller, they can choose to have soap or water dispensed from the sprayer, or to scrub the vehicle with the brush. The number of coins or tokens inserted determines the amount of time customers have to operate the equipment, however in most instances, a minimum number of coins are necessary to start the equipment. These facilities are often equipped with separate vacuum stations that allow customers to clean the upholstery and rugs inside their cars.

Automatic car wash

• Rotating brushes inside a conveyor car-wash. The first automatic car washes appeared in the mid 1950s. Mechanized car washes consist of tunnel-like bays into which customers drive their cars. Some car washes, following the exterior express trend, allow their customers to pay through a computerized POS or point of sale unit, also known as an "automatic cashier", which in many cases may take the place of a greeter. The mechanism inputs the wash PLU into a master computer or a tunnel master automatically. When the sale is automated, after paying the car is put into a line-up often called the stack. The stack moves sequentially, so the wash knows what each car purchased. After pulling up to the tunnel, an attendent usually guides the customer onto the track or conveyor. After both tires have passed over the tire sensor, the wash will pop a roller. The tire sensor lets the wash know where the wheels are and how far apart they are. Once on the conveyor or track, the attendent will usually ask the customer to put his or her vehicle into neutral and release all brakes. Failure to do so will inhibit the conveyor. The rollers catch the tires, pushing the car through a photo eye, which measures vehicle length, allowing the computer to tailor the wash to each individual vehicle. The equipment frame, or arch, vary in number. A good car wash makes use of many.

• A vehicle in the high pressure rinse stage of the wash, just beyond the wraps. Also visible is the conveyor. The customer will first encounter one or two arches, or often called pre-soak arches. They either apply a low ph with a mild alkali, then a high ph with mild alkali. It can vary in reverse in the industry depending on chemical suppliers and formula used. Some use a kick like running it 'hot' with hot water feeds during dilution into a hydrominder of some form. Others go corrosive some being level eight and above using sodium hydroxide, phosphorus, or hydrofluoric acid which can melt glass. Of course, however, ethically car washes are designed not to harm a vehicle's paint.

• The customer next encounters tire and wheel nozzles, which the industry calls CTAs. These will apply either a degreaser with a high alkalinity solution, or even an acid. The next arch should be entrance wraps usually made of neo-glide material. This gentle cloth, despite popular belief, will not scratch the vehicle unless something is caught in them. This is why most washes will not allow anything in the back of a truck go through their wash. These should rub the front bumper and, if programmed with a good cloth pattern, will make a swipe on each side of the rear of the vehicle cleaning the license plate. Past the first wraps or entrance wraps is a tire brush spinning at a high RPM that will scrub the tires. This is usually located beneath the mitters or top brushes.

• Typical "tunnel" car wash view from the inside The mitters cloth can vary greatly between perma color, micro-fiber, or more gentle neo-glide. After the mitters, the car passes through exit wraps which are just like the entrance wraps. This is where the water works begin with high pressure streams of water. The customer either passes over an under carriage wash or gets high pressure nozzles pointed up on a mounted base. Next, if available, is a tire spinner or omni spinner. These are high pressure nozzles angled and mounted on a spindle. When high pressure is forced through, it causes the nozzles to spin rapidly. If timed, programed, and adjusted correctly, the nozzles will follow the front and back rims. Past the omni spinners are the omnis-- high pressure nozzles mounted on the sides and top of an arch. These will move side to side and up and down blasting dirt from the cracks of the vehicle (not yet in the rinsing phase). After passing the omnis, the vehicle may triple foamers, usually red, blue, and yellow.
  
  There are two types of foam: polish and wax. Polish is cheaper and may be harder to rinse off, sometimes becoming solid matter in its holding tank. Wax is more expensive, but rinses well and covers the vehicle with a lighter and puffier foam. It does offer more protection than the polish, but is not what protects overall. The next arch will be mitters to rub the foam on the vehicle. Some washes have multiple rinse stages, usually offering a protectant. Protectants vary greatly with some making water bead (or gather) and some making water sheet (or spread to a thin layer) before being blown away by a dryer. Near the rinse is where a tire shiner, which is made of foam pads that retract and have a thick oily substance pumped through them like glycol to rub across tires producing a wet or new look. Finally the vehicle encounters a spot free rinse of soft water that has been filtered of chlorine and sent trough semi permeable membranes to produce highly diluted water that will not leave spots. After using spot free water, the vehicle usually does not require hand drying. The wash often finishes with this drying, and a light usually indicates for the customer to leave.

• A touchless car wash Old-style automatic washes used rotating brushes with soft nylon bristles, but these tended to put faint scratches in the vehicle's paint. Some brushes are made of soft cloth, and these will will not harm a car's finish. The most current technology is a foam based brush (called a "Wrap"), which is resistant to this when properly lubricated with water. In order to avoid scratching issues, "touchless" or "no-touch" car washes were developed. They use high pressure water and strong chemical detergents (higher or lower on the pH scale), particularly hydrofluoric acid to clean the car. [1] Touchless car washes may not fully clean very dirty cars, similar to washing your hands, but never scrubbing them together.
  
  At "full-service" car washes, the exterior of the car is washed mechanically with conveyorized equipment, but attendants are available to dry the car manually, clean any spots the equipment has missed, and to clean the interior (normally consisting of cleaning the windows, wiping the front and side dashes, and vacuuming the carpet and upholstery).
  
  For areas where water conservation has been implemented, it may not be possible to wash the car with water, and hence a method of washing the car without water (or dry wash) has become popular.

Bikini car wash
Bikini car washes are a summer tradition in the United States, and increasingly in Canada. There are two main kinds of bikini car washes.

The first one is generally a fund raiser for a school, a sport association or any other youth organization or charity. Typically, some pretty college/high school girls in bikinis attract donors by standing on a roadside with colorful cardboard signs, and the cars are washed by their male and female classmates in a nearby parking lot.

The second one is a commercial bikini car wash, where bikini clad girls actually wash the cars for a fee and the entertainment of the drivers. Hooters restaurants usually have bikini car washes in the summer to attract customers.

There are frequent references to bikini car wash in pop culture, for instance in the movie The Bikini Carwash Company or in the Jessica Simpson music video These Boots Are Made for Walkin'.