When a residential dishwasher leaves the bottom surfaces or undersides of plates and bowls dirty while cleaning the tops, the issue is typically caused by improper loading angles, a clogged lower spray arm, or blocked water circulation. If deep bowls or large platters are nested too tightly facing downward in the bottom rack, they create a physical shield that blocks water jets from reaching their undersides. You can troubleshoot loading patterns easily. You can verify that your corrective action is successful when rearranging dishes so all soiled interior surfaces angle downward toward the center spray arms, cleaning clogged spray nozzles, and running a test cycle ensures complete water contact and spotless cleaning across all items.
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