First, what is self-service buffet washing machine washing machine originated in western countries, is the consumer by coin, credit card, yourself a new low-carbon, environmentally friendly car wash car wash equipment, used in various gas stations, high-speed service area, large parking field, towns and rural communities and other places. Self washing machine models currently divided into two categories, the first category, self micro water washing machine, (alias Buffet water washing machine) second class, self-steam washing machine. Both machines cleaning principle is different. Self micro water washing machine are two functions: clean water, foam cleaning, washing two functions combined with each other. Self-steam washing machine mainly by steam cleaning. Second, the principle of a clean, self-help micro-bubble washing machine water to clean water through the power plant to produce high-pressure piston pump high pressure water to wash the surface, water is greater than the impact of dirt and surface adhesion, high pressure water will strip the dirt washed away, to a clean body surface cleaning equipment. Washing with water cannons: by high pressure water pump suction compressed after high pressure hose, and finally by water cannons fired, by controlling the tap water cannons to control the flow of water dispersion size, so that became a high-pressure water jet is enough. Washing with a pressure not exceeding 8Mpa, generally between 5Mpa ~ 6Mpa. Simply put: Buffet washing machine is to use high-pressure, moisture, and the owner himself came to participate in a fashion, health, low-carbon sport I love my car, its billing can follow the duration or the number of washing water consumption to set up. 2, foam cleaning by a professional neutral washing liquid on the body surface contaminants or chemical conversion overlay dissolved stripped to achieve degreasing detergent effect. Many owners of detergent, washing liquid dish detergent and cleaning products are attributable to that use dish detergent, washing liquid detergent and dedicated no difference, in fact, this idea is wrong, doing so will damage the paint. Because household and industrial cleaning supplies to oil, stains, along with the body will be removed together with wax, wax the paint will lose the protective effect of the car's surface. Secondly, some cleaning supplies alkali, strong acid will corrode the rubber protective strip of the car, making it dull, elasticity, and even cracks, so that can not use detergent, washing liquid detergent behind dedicated alternative. To protect the paintwork, car wash to choose a neutral PH value in the professional washing liquid between 6.5 and 7.5, neither the body surface erosion, but also give the body a moisturizing efficacy of maintenance, to protect the paintwork purposes. Third, the international status quo in Europe and Western countries in washing the car quite popular in the United States, the US car ownership accounted for almost one-fifth of the global car ownership, where the car up to 130 million, an average of 1.3 per People have a through statistics, but not to the 30000 car wash. With so many vehicles is how to ensure clean as new vehicle it? The original self-service car wash has become a part of American public life, and self-cleaning equipment is widely throughout the various stations, high-speed service area, a large parking lot, towns and rural communities and other places, which means a buffet car wash coin card among residents in the United States has widely accepted, universal, at the same time saving energy, but also the physical and mental exercise. Fourth, the Ministry of Public Security has announced the status quo of domestic car wash, go to the end of the national vehicle fleet has reached 240 million, of which 120 million car ownership, the annual growth 15.1 million, an increase of more than car ownership in the country by the end of 1999, 18 large In more than one million cars in the city, and our car wash shops and roadside stalls car wash bits add up to less than 160,000. Traditional car wash water cannons are connected to the water, which is the major equipment now mainstream car wash shop. Serious waste of water washing, washing room recycled water washing equipment became furnishings, plenty of water is used for washing secretly, water use can not be promoted. According to statistics, in accordance with this washing method, the country will consume 100 million tons of water per year.