Most dishwashers’ default cycle have two washing stages: pre-wash and main wash. Pre-wash is a brief cycle meant to get the majority of loose soil off the dishes with minimal effort. The detergent cover is closed, so only pre-wash soap, if available, is used in this stage.
When the main cycle comes, the machine opens the detergent cup to allow the soap to fall into the water. For a tablet, every part of it, even the shiny casing, is water-soluble, so it will quickly dissolve as the water runs. Some dishwashers have a water-jet angled specifically to blast the detergent cup to get out any stuck bits of detergent.
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