How to clean the sole plate of an electric iron which has burn stains?

While it is cool and unplugged, scrub it with a damp magic eraser, works great, no other products or chemicals needed.

Is the bottom stainless steel, or teflon? Gentle scrubbing with water and an SOS pad will remove burns from stainless steel, but will damage teflon.

https://www.hometalk.com/diy/clean/appliances/my-iron-is-ruined-32592714

https://www.youtube.com/watch?v=rm3gRpfP-EI

Iron some salt on a cloth

Make a paste of baking soda and water, then carefully polish the bottom of the iron with it. Use a damp cloth to remove any residual baking soda, then dry carefully.

I iron over a wet microfiber cloth. Good luck!