How do you clean oven racks?


I read to wrap them in aluminum foil, put them in the bathtub covered in hot water, then add dishwasher tablets, but will this damage my bathtub? It is not porcelain... maybe it is fiberglass or some sort of 'plastic' feeling material. Anyone know any other 'magic' potion for cleaning the oven racks BESIDES elbow grease?

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