Praise be to Allah.
We put this question to Shaykh Muhammad ibn Saalih al-Uthaymeen, may Allaah preserve him, who replied as follows:
So long as we know that most of the food cooked in it is impure, such as dead meat or pork, then we have to ask, but if we do not know that, then we do not need to ask.
And Allaah knows best.
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