Abstract: The invention relates to a water extraction cleaning machine having a variable solution mixing valve adapted to create cleaning solution mixtures of variable constituent ratios. Clean water and detergent are provided from tanks supported on the water extraction cleaning machines. The size of the detergent inlet opening can be altered through rotation of a control knob provided on the outside of the water extraction cleaning machine. The knob is interconnected to at least one member which is adapted to vary the size of one of the detergent fluid inlet and the clean water inlet so that the ratio of constituent elements can be altered depending upon the cleaning application.

Abstract: An upright water extraction cleaning machine having an assembly of tanks efficiently stored on and interconnected to the machine is shown. The tank assembly has at least two tanks nested with one another and having one-way valve mechanisms on the bottom thereof. The two tanks are slidably mounted to one another and the tank assembly is slidably mounted and operatively connected to the machine. With this structure, the user can quickly and easily remove and refill the tanks and continue operation of the machine with a minimum amount of interruption and delay.

Abstract: A water extraction cleaning machine has a suction nozzle assembly with two suction nozzle openings incorporated. The suction nozzle openings are preferably positioned one on each side of the cleaning solution spray nozzles so that the cleaning machine can be used for simultaneous application and removal of cleaning fluid regardless of whether the user is pushing or pulling the cleaning machine. In another aspect, a plate member is slidably mounted to the bottom of the suction nozzle assembly. The plate member has a pair of suction nozzle openings which are spaced to seal one of the two suction nozzles of the suction nozzle assembly depending upon the direction of travel of the suction nozzle assembly.