My neighbor asked my opinion on this and I'm turning to the experts. She
has a dark gray with speckles (granite appearance) vanity in her bathroom
which she thinks is Corian but not sure. She has kept a white pill holder,
about 8 inches square, on the counter for about a year and now the color in
that spot has whitened. Any idea on how to clean it if it is Korean? And
if it's not? I saw it and it's pretty unsightly.

Thanks.