He did that. It was perfectly cleaned ... in a dishwasher.
I think the worst that I have done is burn the seasoning off one of my dutch ovens on a camp stove while out camping. I put the dutch oven on a camp stove, put a steam tray in it, and then put a 9" round pan in it. I was able to make good fresh cobbler this way. I did have to re season the bottom of the dutch oven after this though. Live and learn.