How to clean stove grates | Debbiedoos
I used 1/4 cup of ammonia per grate.
So 1/4 times 4. If your grate will fit in a ziplock baggie, that is even better.
Mine were too large so I put all four of them in a big garbage bag along with my ammonia.
Tied it up, and let it sit over night in the laundry room.
Also, recommended to put bag outdoors on a warm sunny day.