Soaking baking dishes is a great way to remove grease and grime without lifting a finger. The same goes for your oven racks. Give them an overnight soak in the bathtub, after first laying a towel down to protect your enamel from scratches. Lay your oven racks on top, fill the tub with the hottest water you can, and swish in some laundry detergent. Call it a night, and then go to bed. When you wake up, the grease will have dissolved, and all you need to do is rinse and dry.