you might use any of the following methods to remove residue from every nook and cranny of the racks.

The steam will help loosen the mess.

Additional Tips to Keep Your Oven Racks Clean Longer

How to clean an oven rack

The Spruce / Sanja Kostic

Materials needed to clean oven racks

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Spraying the oven rack with cleaner outdoors

The Spruce / Sanja Kostic

Scrubbing the oven racks with a brush

The Spruce / Sanja Kostic

Soaking the racks with ammonia and covering in a plastic bag

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Scrubbing the oven rack after soaking in ammonia

The Spruce / Sanja Kostic

Placing the oven rack in a plastic tub before spraying with cleaner

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Closeup of scrubbing oven racks with a brush

The Spruce / Sanja Kostic