Kashrut: Dairy/Meat: Dishwashers: Neutral/Pareve Item

You may not wash a neutral/ pareve dish in a meat or milk dishwasher--even if there are no dirty dishes with milk or meat on them and even if there are no other dishes in the dishwasher. If you did, the neutral/pareve dish may have become the gender of the dishwasher, but consult a rabbi for leniencies.
Situation You have a meat or milk dishwasher and you washed a neutral/pareve utensil in it.
What To Do If the dishwasher has dirty dishes containing milk or meat food, the neutral/pareve utensil will become that gender. However, if the dishwasher does not have any dirty dishes with food of either gender on them and the dishwasher has not been used for at least 24 hours, the pareve dish will remain pareve.
NoteThis is a b'di'avad (after the fact) case. You may not intentionally (l'chatchila) wash the pareve utensil in a gendered dishwasher.