Description : How can I get a mark from a blue pen out of a white cotton duvet cover?
Last Answer : Buy Grandma's Best. you can get it at Hobby Lobby or online. put a drop on the spot, put a drop of plain water on it, and rub. you can try scratching a bit with your fingernail, but don't damage ... launder it before it dries. Let the item air dry and check the spot. If it's still there, retreat it.