Rice Cookers and kashering

Kashrut Hagalah and Libun
1

Dear Rebbaim,
I’m wondering about rice cookers and if/how to kasher them when needed. if, for example, someone wanted to give you a used one and they did not keep kosher.
Specifically, I’m curious about more complex/expensive machines, such a Zojirushi machines, that have multiple settings, almost like a crock-pot, and have a button for “porridge” which is likely used for congee, that would be rice cooked in broth.
Can this be kashered? if so, how?

Thank you!

2

Is there an insert that can be removed? If so, stick it in an oven on high for a few minutes for the metal to get hot. If this will damage the insert, then you can boil water in it with cover on and you’re good to go.