Locate the filter system in the bottom of your Whirlpool dishwasher, underneath the arm.
Grasp the cylindrical upper filter with your hand. Turn it counterclockwise one-fourth of a turn. Lift the filter assembly out of the dishwasher.
Separate the upper and lower filters by carefully pulling them in opposite directions.
Fill a large, shallow bowl with 1 cup of water and 1/2 cup of white vinegar. Soak the filters in the diluted vinegar solution for 20 minutes to remove mineral deposits and hard water stains that can clog the filter screens.
Hold the upper cylindrical filter under running water to rinse it. Gently scrub the filter with an old, soft toothbrush, if needed, to remove stuck-on debris. Repeat this step with the half-moon-shaped lower filter.
Set the filters on a clean towel to air dry for 30 minutes. Place the filters back in your Whirlpool Gold Quiet Partner IV dishwasher per the manufacturer's instructions.