The past few days, I have been trying to work on the project of cleaning the gas range here: rental range I asked for some advice after trying several different methods on my own, to attack various issues.
Next up: the black, cast iron stove top grates. They are in another plastic tub with a lid (the bag I used leaked slowly) with some amonia (supposedly it's the amonia fumes which clear off the gunk). This tub is in the garage, right next to the overhead door where some air always comes in. I am letting them set overnight. Will check in the morning, opening the tub outside, to release the fumes. Not much else I can try, I've given it my best and yes, the stove looks much better and I know that it's much cleaner.