Most residential dishwasher spray arms are sealed plastic molded assemblies that are not designed to be opened or split apart. However, some models feature snap-fit plastic construction that can be gently pried open for deep cleaning, though doing so risks snapping the delicate plastic tabs. Fortunately, opening the spray arm is rarely necessary because soaking the entire sealed unit in warm white vinegar for thirty minutes dissolves hard water scale, and flushing water through the central inlet effortlessly flushes out loosened debris through the spray nozzle holes.
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