Pyrolytic self cleaning ovens
The better designed ones will clean the racks and all the other interior oven parts at the same time. This is always been the way with the US pyrolytic ovens, ironically, there’s some high-end ones that they do want you to remove all the racks and things the ones that have the silly roller shelves generally cannot be self cleaned.
In addition to the racks, I often put pieces of Corningware or porcelain enameled, boiler pans, etc. to clean those at the same time.
GE has gone to porcelain enamel racks which clean beautifully without any discoloration, the chrome racks tended to discolor the first time they are cleaned, but the soft gray color is just fine with me just so I don’t have to clean them, lol
John