A method and apparatus for removing native oxides from a substrate surface is provided. In one embodiment, the apparatus for removing native oxides from a substrate surface includes a showerhead assembly. One embodiment of a showerhead assembly includes a hollow cylinder, a disc and an annular mounting flange. The hollow cylinder has a top wall, a bottom wall, an inner diameter wall and an outer diameter wall. The disc has a top surface and a lower surface. The top surface is coupled to the inner diameter wall. The lower surface is coupled to the bottom wall. The disc has a plurality of apertures connecting the lower surface to the top surface. The annular mounting flange extends from the outer diameter wall of the hollow cylinder. The mounting flange has an upper surface and a lower surface. The upper surface is coplanar with the top wall of the hollow cylinder. The lower surface having an elevation above the top surface of the disc. In another embodiment, a resistive heater is embedded in the hollow cylinder proximate the disc.