I Now Swear By This Hack!

Fill the tub with hot water, covering the racks completely. The hotter the water, the better the cleaning.
Add the Dishwasher Tablet:
Drop a dishwasher tablet into the water. This common household item does wonders on baked-on grime.
Soak Overnight:
Let the racks soak overnight. The dishwasher tablet will break down the grime, requiring no scrubbing from you.
Rinse and Dry:
The next morning, rinse the racks thoroughly. The grime should slide off easily. Dry with a clean towel and reinstall in your oven.
This simple trick leaves your oven racks sparkling clean with almost no effort. Give it a try and enjoy a spotless kitchen!