Putting your knives in the dishwasher do not dull them significantly compared to what you use them for. Water certainly takes years to wear anything down and any grit in the dish soap would wreck plate designs and cause more problems than it would be worth.
What you do is sharpen them regularly and handwash them. Not to keep them from getting dull but to keep someone from cutting themselves when emptying your machine.
This from 70 years in the restaurant business.
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