At One Place

What can and cannot go in the dishwasher

5 questions about what you can dishwasher — 0 yes, 3 no, and 2 that genuinely depend on the specifics.

Question Answer Short version
cast iron No No. Dishwasher detergent strips the seasoning and the pan rusts within hours.
knives No No, if you care about the edge. Heat, detergent and knocking all dull and damage it.
non-stick pans It depends Only if the maker says so, and it still shortens the coating life considerably.
insulated bottles It depends Only if it says dishwasher safe. Older vacuum flasks can lose their vacuum and stop insulating.
wooden spoons No No. Prolonged soaking and heat raise the grain, then crack and split the wood.

Read the full answer