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Of course you can stick the blade in the dishwasher. It works fine. What do think the dishwasher is doing, sandblasting?

Throw your knives in the dishwasher and they’ll dull right quick.

Food processor blades are usually stainless steel, which is a lot less sensitive to the dishwasher.

And food processor blades are driven much harder than hand knives, so they don't have to be as sharp.

Some substances in the dishwasher detergent are bad for steel, like sodium silicate.