Can fish that was baked in a dairy oven by accident be used at a fleishige seuda? The oven was ben yomo of being used to cook milchigs. Can we use plastic keiliom at the seuda and serve the fish?
Yes. Even according to those who hold not to use an oven for milchig and fleishig, that would only be not to eat them together, but you are not eating the fish together with meat in regardless. You surely can serve the fish on plastic keilim, instead of using your fleishig ones for the fish.