How can I easily clean oven racks?

Take them out and soak the in the bathtub overnight with blue dawn dish soap.This will aid in loosing up the grease.

I'd take them outside and lay them on newspaper....spray them entirely with oven cleaner, let set, then rinse. Scrub where needed or just repeat the process. I do this now and then and it works great. Best of luck.

I use cheap motor car engine degreaser (approx. $4 and place racks on newspaper and spray. Wait the required time and hose off. Repeat if necessary, very unlikely though.

Thank You! never heard that one before.

Soak in ammonia overnight outside

Here's a few suggestions:

https://www.hometalk.com/diy/clean/ovens/cleaning-oven-racks-in-the-bathtub-28053516

https://www.hometalk.com/diy/clean/appliances/how-to-clean-oven-racks-in-the-bathtub-10384275

https://www.hometalk.com/diy/clean/ovens/the-easy-way-to-clean-your-oven-racks-2899569

https://www.hometalk.com/diy/clean/ovens/how-to-clean-your-oven-with-just-baking-soda-29142677

For standard cleaning, use a soapy sponge and hot water to wipe the racks. For stubborn messes, soak oven racks in hot water, dish soap, and a couple scoops of baking soda. Let the racks soak in this mixture for 15 to 30 minutes before scrubbing clean with a soft sponge.