Load Utensils Handles Down: The better approach for thorough cleaning is to place forks, spoons, and other silverware with the handles pointing down. This lets the washing jets reach the eating surfaces without obstruction. Knives are the exception. Always load knives with their blades pointed down and the handles up to reduce the risk of accidental cuts when unloading. Most importantly, no matter how you load your silverware, make it a habit to wash your hands well before unloading the dishwasher or handling clean dishes. That simple act makes a bigger difference for your family’s health than any utensil loading strategy.
Use Auto Cycle or Quick Cycle: Some dishwashers have an "Auto" cycle, which is specially equipped to scan the load using built-in sensors and adjust for the mess accordingly. If your dishwasher has an auto mode, that’s your best bet for a consistently clean load. If it doesn't, try the quick/eco cycle. If that doesn't do a good enough job, use the normal cycle.
Do Not Overly Pre-Clean: Scraping (not rinsing) large chunks of food off the dishes should be done to avoid clogging the dishwasher’s filters, and pre-treating any heavily greasy or grimy dishes. However, don’t get every food stain off the dishes before they go in. Modern detergents and dishwashers are designed to work with food residue, and pre-rinsing can actually hinder their cleaning performance. The enzymes in dishwasher detergents need food particles to latch onto and break down. Further, a small amount of food residue is actually what helps initiate the sensors in auto mode on modern dishwashers. And pre-rinsing just wastes water which is not good environmentally speaking.
Load the Racks Properly: Bowls and cups should be facing downwards. The spray arms and detergent dispenser shouldn’t be blocked. Glasses should be placed between tines (not over them), and larger items should be placed on the bottom rack with smaller items on the top shelf. Take a course on the Bernoulli Principle.
Avoid Overcrowding: Overcrowding the dishwasher is one of the most common issues that cleaning experts encounter, and it’s especially important to avoid for the top rack. When faced with a mountain of dishes, it can be tempting to make everything fit so you won’t have to run a second load. But taking the time to load the dishwasher correctly —ensuring that dishes aren’t touching and the machine isn’t overcrowded —will save you time, water, and energy in the long run.
Run Hot Water at the Sink Beforehand: Running hot water at the sink before starting your dishwasher is a quick and easy way to ensure cleaner dishes. This will ensure the dishwasher begins the load with hot water, rather than cold water, resulting in reliably cleaner dishes.
PS: For more detailed help, see this article from The Spruce.
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