When a residential dishwasher leaves dishes on the bottom rack dirty while items on the top rack come out clean, the issue is usually caused by a blocked lower spray arm, a clogged sump filter restricting water intake, or an overloaded bottom rack that physically blocks water jets. If food debris or toothpicks clog the tiny spray nozzles on the rotating lower arm, water cannot reach the plates. You can troubleshoot spray arm obstructions easily. You can verify that your corrective action is successful when removing the lower spray arm, clearing trapped food pulp out of the holes with a toothpick, rinsing it clean, and reloading the bottom rack properly restores powerful water jets that clean plates thoroughly.
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