It never occurred to me to use it to clean a cast iron pan before re-seasoning, good idea. Why put anything on the bottom of the oven? Will it discolor it or something? I sometimes put my pizza stone directly on the bottom of the oven when I run the selfclean without any problems. I know it can harm the racks if they are left in. The former owner of my house ran selfclean in my former oven with the racks in, they did not side well. They worked fine, they just did not side as smoothly as they could have.
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