Patent ID: 7717354

Claim:
A method of cleaning with a cleaning system, comprising the steps of: providing a cleaning system comprising: a fresh liquid tank, the fresh liquid tank containing water; a waste recovery tank; a fresh liquid pump operable to pump the water from the fresh liquid tank; a vacuum source for enabling a soil-containing fluid to be vacuumed into the waste recovery tank; a fresh liquid supply line fluidly connected to the fresh liquid tank and the fresh liquid pump, the fresh liquid supply line including an outer end; a spray gun/venturi chemical injector assembly comprising a spray gun assembly and a venturi chemical injector assembly at the spray gun assembly, the venturi chemical injector assembly including a fresh liquid inlet, a liquid cleaning chemical inlet, and an outlet, the outer end of the fresh liquid supply line fluidly connected to the spray gun/venturi chemical injector assembly; a liquid cleaning chemical container including an opening and containing a liquid cleaning chemical, the liquid cleaning chemical container wearable by an operator; a liquid cleaning chemical draw line including an inlet end and an outlet end, the inlet end fluidly connected to the opening of the liquid cleaning chemical container, and the outlet end fluidly connected to the liquid cleaning chemical inlet of the venturi chemical injector assembly, the liquid cleaning chemical draw line having a length sufficient to enable the operator to maneuver and use the spray gun for cleaning a surface when the operator is wearing the liquid cleaning chemical container; the spray gun assembly including a low-pressure setting in which the liquid cleaning chemical is drawn by suction into and through the venturi chemical injector assembly when the water is pumped into and through the spray gun, the spray gun assembly further including a high-pressure setting in which the liquid cleaning chemical is not drawn by suction into and through the venturi chemical injector assembly when the water is pumped into and through the spray gun; wearing the liquid cleaning chemical container, whereby the liquid cleaning chemical container stays with the operator but the operator is not hand-carrying the liquid cleaning chemical container; activating the spray gun in the low-pressure setting, and spraying a mixture of the water and the liquid cleaning chemical from the spray gun onto a surface being cleaned, the mixture formed at the spray gun/venturi chemical injector assembly, the liquid cleaning chemical supplied from the liquid cleaning chemical container worn by the operator; and activating the spray gun in the high-pressure setting, and spraying the water from the spray gun onto the surface being cleaned, the water sprayed from the spray gun having a pressure sufficiently high to provide a mechanical cleaning action on the surface being cleaned without damaging the surface being cleaned.