The stove had this greasy, brown gunk on it, and that crud was not coming off, despite my many efforts. I tried basic household cleaners, I did long, hot water soaks, baking soda, vinegar, literally … tried. it. all.
Here’s the trick!
*Let me preface this by letting you know that ammonia and bleach create deadly fumes when mixed, so PLEASE be careful when using ammonia to make sure there’s no bleach nearby. There’s my disclaimer.*
Pour about 2/3 cup of ammonia into each bag, making sure to seal each immediately after pouring … those fumes are a little intense. The ammonia DOES NOT need to cover the grates, it’s the fumes that do all the work!
Let them sit, sealed overnight (or all day).
Open one at a time and dispose of the ammonia bag, then wipe the grate with a simple sponge under a little running water. Watch as it just wipes right off the grate, with no damage to it!