What’s the status of a Milchig knife (not used for Milchig in 24 hours) that was used for Pareve and was put in the Fleishig sink with dirty Fleishig dishes and rinsed in hot water?

The Milchig knife needs to be Kashered. The Fleishig dishes are fine.

Sources:

.סי’ צ”ה ש”ך סק”י