Processing poultry includes the application of electrolyzed water as one step during the processing process. For primary cleaning of the coating booth, blast air and corresponding suction operations are used, whereby blowing and suction can be carried out simultaneously, cyclically or sequentially. The aluminum oxide etch stop layer may also be used in the back-end of advanced CMOS processes as a via etch stop layer. The filler material may be a non-metallic material, such as a tube of plastic. The retainer is secured on the post adjacent the inner surface of the helmet.