This works for me.
Lay down a towel: Line the bottom of your bathtub with two old towels. This is very important to prevent the oven racks from scratching your bathtub. Place your oven racks on the towel.
Cover the racks with hot water: Fill your bathtub with very hot water until the oven racks are covered.
Add dishwasher detergent: Add 1/2 cup of powdered or liquid dishwasher detergent to the bath water. Swish around until dissolved. Allow the racks to soak for 4 hours, or overnight.
After soaking, gunk and stains on the racks should be soft and easy to wipe off. Use a non-abrasive scrub brush or sponge with a little Bon Ami or Bar Keeper's friend to tackle any remaining tough spots.
Rinse with water and dry completely.
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