If have someone leave a white ring or mark on your real wood furniture from too hot of a food or liquid? Well here is a way to reduce or get rid of the mark.
Add mayo plain at first if this doesn't work add a little wood ash to it but be careful of the surface can be too abrasive
This is just plain mayo. Now rub hard in circle motions and keep for a few minutes rubbing the surface may need to reapply mayo again
My dresser was saved no mark left. My dinner table needed me to add a little wood ash and I apply it a couple times but was successful in the end
This idea I got from wood workers who repair furniture. Good luck and next time tell them to use a coaster!