OK, after trying mayo, fine grit sandpaper and researching, my mother-in-law had the solution that worked! We applied moist heat in the form of a damp, steaming bar mop. All the white marks are gone!
I am SOOOO grateful! I'll apply regular
) coatings of mineral oil
) to keep them from drying out further. As it turns out, these pieces are even more sentimental than I originally thought: My uncle sent them to my grandmother many years ago while he was stationed overseas. Although he has since passed on many years ago, he's still alive in all our hearts. Thanks for keeping this forum going!