What happens next?

How to erase old marks off a dry erase board
Use rubbing alcohol.
Wet a sponge with alcohol and rub it into the stain. Dry the board with a clean, dry cloth.

Choices:
a). If you've covered the wood panel with an oil-based stain, use an enzyme cleaner to remove those last few stain-removers. Block the stained area using wood filler.;
b). Use 99% or 90% isopropyl rubbing alcohol for the best results. You can put rubbing alcohol directly on a paper towel or tissue and rub that on the old marks.;
c). Other abrasive spirits may also work for your stained mark. Cleansing spirits such as glass cleaner, microfiber cloths, soap, or cider vinegar can also work for your stain-removing agent.;
d). If you can find rubbing alcohol in the hardware store, it is relatively safe to use. No scratch remover will remove ink, but a bit of rubbing alcohol may find stubborn dirt or clumps and clean up a crack in the border.;
b).