How to Clear a Blocked Dishwasher Drain

Remove the bottom rack from the dishwasher to access the heating element and drain.

Locate the drain basket at the bottom of the dishwasher and inspect it for debris. Remove any debris caught in the basket then use a screwdriver to remove the screws that hold the basket in place.

Lift the dishwasher drain basket out of the dishwasher and inspect it for large pieces of debris blocking the drain. Remove any debris, being careful to watch out for broken glass.

Place 1/4-cup of baking soda into a bowl and mix it with enough water to make a thin paste. Pour this paste down the dishwasher drain.

Pour 1 cup of vinegar into the dishwasher drain and allow it to sit in the drain for 15 minutes. Rinse the drain by pouring boiling water into it. If the clog is not resolved, repeat the process.