Dissolve some store-bought stain remover or laundry detergent in warm water and soak. Repeat until no grease odor remains. Never machine dry anything that has ever had any type of grease or oil.
Q: Water leaked into our below-ground, wood-paneled den and seeped into the wall and baseboard. We fixed the source of the leak, and the wall is dry now. But the wood is heavily stained.