Pneumatic detergent applicator with a 50 liter tank in painted steel. The inside of the tank has a plastic layer that prevents the chemistry from coming into contact with the steel. This avoids oxidation and the formation of rust in the tank. The detergent applicator is supplied with a level indicator on the tank and a pressure gauge for monitoring the pressure in the tank. The safety valve is set to 8 bar. The tank is filled 3/4 (38 liters) full of chemicals and the rest with compressed air.