Hello, try some rubbing alcohol, it should remove the marker
Try writing over it with a dry-erase marker and then wipe if off.
Rubbing Alcohol should do the trick, do not use acetone as it will mar the varathane.
Magic eraser does it for me every time. Grandkids seem to find the permanent markers every time they want to draw. When they are finished, I give it to them to clean up. Then I wipe dry and polish it.
Did it work for you?