Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Do NOT put in dishwasher

My wife put one of these pans in the dishwasher after the first time it was used. It came out with the finish ruined, completely discolored, and is now unusable. We have put other less expensive baking sheets in the dishwasher before and they came out fine. Very disappointed that the pan did not survive a simple wash. Wish I could return it!