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The reason is that dishwasher detergent is an enzyme based cleaner. Those enzymes need something to react withm.

You still want to scrape of loose food, of course, or yes you'll get a dirty filter faster.

And for those enzymes to work efficiently you need hot enough water from the very beginning of the washing cycle. See the video link I posted in another comment.

Hah, I knew exactly what it would be before I looked

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