Those greasy, food-splattered stove burners are gruesome and a real chore to try to scrub clean. With an overnight soak of cheap ammonia, however, that thick coating of crud comes off like nothing, writes Vivienne at the V Spot blog.The instructions are clear and simple:
Take about 1/4 cup of ammonia and seal it up with one of the burners in a large ziploc bag. You only need a little ammonia in the bag. You are not trying to soak the burner… you just want to seal it up with the ammonia fumes.
I leave it outside on a cookie sheet overnight. (You can leave it inside, but I move it outside just in case the bag springs a leak or something. Stinky.) It is the fumes from the ammonia that dissolves all of the grease and hardened oil. You don't need to soak it, it just needs to be sealed up with the ammonia fumes.
When it's done sitting, it should wipe clean with a sponge.
(Note that you don't want to do this on aluminium surfaces because of pitting, nor should you ever combine ammonia with bleach.)
As some commenters have noted in the article thread, you can also use a large garbage bag to deep clean a bunch of items, and also recycle the ammonia. Deep cleaning of one of the grimiest things in the house, on the cheap and without the elbow grease, is a win in my book.
Cleaning Stove Burners & Grates Using Ammonia [The V Spot]