A substrate dry cleaning apparatus, a substrate dry cleaning system, and a method of cleaning a substrate are disclosed. The substrate dry cleaning system includes a substrate support and a reactive species generator. The reactive species generator includes a first conduit defining a first flow channel that extends to an outlet of the first conduit, the outlet of the first conduit facing the substrate support, a first electrode, a second electrode facing the first electrode, the first flow channel disposed between the first electrode and the second electrode, a first inert wall disposed between the first electrode and the first flow channel, and a second inert wall disposed between the second electrode and the first flow channel.