Hey thanks guys!

I have been trying to remember to give the mayonaisse a try on similar white
stain on my dark oak desk top. I just ran upstairs, grabbed the bottle of
Miracle Whip dressing and rubbed the stain away in about 10 seconds, with
bare fingertips (wiped residue away before the dog did - he is watching).
It is gone. The true test will be in seeing if it stays gone.

RonB