Take a thin zip tie (or a flexible drain brush). Insert it gently into that pump inlet hole. Wiggle it around. You will likely pull out a slimy, gray chunk of biofilm, broken glass, or a fish scale-like piece of corn husk. This single step fixes 80% of slow drains.
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If your kitchen setup includes a chrome cylinder mounted next to your sink faucet (an air gap), remove the decorative cap. Unscrew the plastic inner cap and check for food buildup. Clean it out using a bottle brush. how to clean out a dishwasher drain exclusive