Abstract: An air handling system is equipped with a system for cleaning the air handling evaporator core in situ. Water is distributed through an intake manifold consisting of a plurality valve or other flow control device. Here, the water picks up treating agents, such as microbicides and cleaning agents. In one of the valves or other flow control devices, the water does not pick up a treating agent, and is used for rinsing. The treated or untreated water flows through a connector to an outlet manifold for contact with an evaporator core of an air handler.

Abstract: Aqueous cleaning compositions in which the pH is controlled comprise an acidic metal cleaning compound; at least one nitrogen containing compound to provide a stabilized pH; an emulsifier, a nonionic surfactant and optionally at least one water soluble solvent having a vapor pressure of less than 4 mm Hg at 20° C.

Abstract: In aqueous odor control composition comprises an evaporation control system, at least one nonionic surfactant, fragrance, and water. The odor control composition is particularly well suited for use in air ducts, crawl spaces, basements, and insulation, as the composition releases odor control ingredients at a very slow rate and does not contain any environmentally hazardous materials.