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Disinfectants are substances that are applied to non-living objects to destroy microorganisms that are living on the objects. Disinfection does not necessarily kill all microorganisms. Dr. Rodney McKay used disinfectant on his hands almost immediately after coming from a bio screen. (SGA: "The Kindred, Part 1") Lt. Tamara Johansen uses an extra strong batch of alcohol as an disinfectant. (SGU: "Trial and Error")