Image of a stainless steel spoon on a white countertop, with tiny, dried crusty bits of green avocado flesh adhering to its surface, illustrating the challenge of cleaning avocado remnants after a dishwasher cycle.

You really need to rinse or scrub off anything that came in contact with avocado before you put it in the dishwasher. That stuff dries on there like concrete and is going to come out of the dishwasher with icky little bits crusted on. Just do the pre-wash.