Koshering a dishwasher

My son moved into a new apartment. The dishwasher is made of plastic on the inside. How can he kosher it? We don’t know who lived there before him.

If it’s clean it’s good to go. No need to specifically kosher it.

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Hi would the same apply to using the same racks for meat and milk

Yes, a dishwasher does not require koshering. A dishwasher can be used for meat and milk dishes simultaneously.

See Ohr Yitzchak

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I really appreciate it when the relevant teshuva is posted with the answer!