Be very careful doing this. The water can become superheated and explode when the surface tension is broken. Honestly, it's probably better to find an alternative way to clean your microwave.
Couldn't you put a little salt or something in it to make sure it has a nucleation point to start boiling
I'm not sure. That sounds like it might work, but I don't have any source to know if it will.
There's nothing special about a microwave that will superheat water. You can superheat water on a stovetop, but nobody ever says not to boil water on a stove.
Be very careful doing this. The water can become superheated and explode when the surface tension is broken. Honestly, it's probably better to find an alternative way to clean your microwave.
Couldn't you put a little salt or something in it to make sure it has a nucleation point to start boiling
I'm not sure. That sounds like it might work, but I don't have any source to know if it will.
Ok now I want to do it more
There's nothing special about a microwave that will superheat water. You can superheat water on a stovetop, but nobody ever says not to boil water on a stove.