How to clean a whirlpool dishwasher without a removable filter?

To clean a Whirlpool dishwasher without a removable filter, which applies to older Whirlpool models with self-cleaning filters or hidden filters, you need to clean the interior with hot water, vinegar, and manual scrubbing of spray arms and drain area. First, empty dishwasher completely and remove bottom rack to access bottom area. Second, clean drain area: check bottom sump for food debris, use paper towel to remove visible food particles, grease, and broken glass from around drain cover, use old toothbrush to scrub around drain grate where filter would be. Third, clean spray arms: remove lower spray arm by twisting center nut counterclockwise, remove upper spray arm, rinse under running water, and use toothpick to clear clogged spray holes that cause poor cleaning. Fourth, run hot cleaning cycle: place 2 cups of distilled white vinegar in a dishwasher-safe bowl on top rack, or pour 2 cups directly into bottom, and run hottest cycle like Normal or Heavy with no dishes and no detergent, vinegar dissolves grease and hard water scale. Alternatively, use one Affresh dishwasher cleaner tablet placed in detergent dispenser, which is recommended by Whirlpool and dissolves buildup. Fifth, clean door gasket and edges: wipe around door seal with vinegar solution and old toothbrush to remove mold. Run monthly cleaning to prevent buildup.