Contact (portal) washing. Contactless washing Removing contamination is carried out using special potent detergents (active foam or non-contact shampoo) and powerful jets of water under high pressure. The main thing – when contactless car wash only touch of water and cleaning solution touch. Contactless car wash is the safest and most gentle for the paintwork. There are five main factors for successful contactless washing: water quality, washing temperature, chemistry, time and water pressure created by the equipment. If all these factors are set up correctly, the cars will be clean and shiny without any chance of damage to the paintwork. High-end car washes necessarily monitor these factors.