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White vinegar and a wire brush. Scrub away with that and then warm the grates up some, rub some more vinegar on it with it warm, then rinse it off with water and wipe it down with oil on a paper towel before using.Just adding this to the thread as an FYI:
I looked it up to be sure, and my oven gets to 900 degrees, so not happening today. The grates I'm trying to clean are similar to the racks they say to remove. Going to try something else instead. Leg quarters were on sale at Rouse's so I need this done by the time they defrost.