What's the best thing to run through a dishwasher to clean it?

The best thing to run through a dishwasher to clean it and remove grease, food residue, hard water scale, and odor is a combination of Affresh dishwasher cleaner tablet, white vinegar, and baking soda, each serving different cleaning purposes. Affresh dishwasher cleaner is considered best overall commercial cleaner and is recommended by Whirlpool, KitchenAid, and Maytag, it contains powerful surfactants that dissolve limescale and detergent buildup in pump and hoses, just place one tablet in detergent dispenser and run hottest heavy cycle with no dishes once per month. White vinegar is best natural inexpensive option: place 2 cups of distilled white vinegar in a bowl on top rack, sprinkle 1 cup baking soda on bottom, and run hottest heavy cycle empty, vinegar's acetic acid dissolves mineral scale and deodorizes. Finish Dishwasher Machine Cleaner is another highly rated liquid cleaner that removes grease. Cascade Platinum dishwasher cleaner also works well. For monthly maintenance, use Affresh tablet, for weekly deodorizing, use vinegar bowl method. Avoid using bleach in stainless steel tub dishwashers as it can damage stainless and rubber seals, though 1/2 cup bleach is okay in plastic tub models for disinfecting. Also clean filter monthly by twisting counterclockwise and rinsing, and clean spray arm holes with toothpick to ensure water flows properly.