The best and easiest way to clean oven racks is to first lay some old newspapers inside of a trash bag. Next lay the oven racks on the papers then spray liberally with oven cleaner. I do this outside of my home. Then let them stay for several hours or overnight. Finally, rinse the racks with a water hose, dry them, and put them back into oven.
By Patricia Hamm from Lexington, NC
Placing dirty oven racks in a plastic trash bag with some household ammonia is an effective method for cleaning them. This is a page about using ammonia for cleaning oven racks.