Most residential dishwasher spray arms are manufactured as sealed plastic molded units that are not designed to be opened, split apart, or disassembled by the user. However, some specific manufacturer models feature snap-fit plastic construction that can be gently pried open for internal cleaning, though doing so carries a high risk of snapping the delicate plastic seams. Fortunately, opening a 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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