Wait wait. Do people not just cook a potato and wipe it down after as cleaning?
My whole life when the microwave needs a wash, you put in a big potato in a bowl of water, like an Idaho, or up to three Yukon gold or baby reds (whatever fits your bowl)… you prick them with a fork, put them in a large soup bowl with like a half inch water, and microwave for 11 min on high.
Let sit for 3 min after it’s done and eat as a baked potato or mashed potato, whatever you like, it’s a potato.
But then importantly you clean the microwave because the steam from 11 minutes of potato loosens all the shit and you can just wipe it out.
Cleaning is as easy as making dinner sometimes.
Seems like work with no up-side, since no potato.
You could add a lemon to your potato for the same effect I guess. (But for real just the water vapor does the job 100% a bowl of water would do the job but making a potato wastes less energy because you are making food)