When my oven racks get dirty or covered with spill-overs, this is what I do. Get a very sturdy thirteen gallon garbage bag, pour enough sudsy ammonia in it to cover the oven rack, lay on a flat surface (preferably outside for ventilation purposes), such as a half sheet of plywood or the picnic table, put the rack in the garbage bag, let sit overnight, remove the next morning.
You should be able to remove the grease and grime with a scrubber and very little effort. You can dilute the ammonia if you wish, but I would not dilute it any more than half water and half ammonia or the results won't be what you are needing.
If you feel that there is not enough of the ammonia covering the rack, you can very carefully turn the bag and rack over, but beware of poking holes in the bag with the oven rack.
By Joyce Lambert from Nokomis, AL
I did this today & it worked like a charm. I was careful to not leave the racks in the ammonia for longer than a few hours after reading comments about discoloration. I did not have that problem. I was able to scrub the grease build-up off with a plastic scrub pad rather easily. It came off easily. It took a lot of time simply because of the numerous metal rods in the rack itself. It took virtually no "elbow grease" just time.
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To clean the racks in your oven, pour 1 cup ammonia into a trash bag, add the racks and seal for 24 hours. Use a nylon scrubbie to remove loose debris. Works great!
To clean oven racks a lot easier, remove them from the oven and put them in a heavy duty garbage bag. Pour in 1 cup of ammonia and then tie the bag shut.
To clean oven racks or grill racks, place in plastic garbage bag and add 1 bottle of ammonia. Tie up bag and leave overnight. The next day, wipe clean. Sometimes a second night works better if it is real heavy with grease, but the ammonia will cut through the grease!