If you're not into covering your eating and meal prep surfaces with harsh chemical ingredients, give this all-natural baking soda method a try. All you need is soda water, baking soda, plastic wrap and patience. For this method, make your paste just like you did on the previous page, but use baking soda and soda water, instead. Brush the paste on the stain, and cover it with some plastic wrap. This time, you're going to need to leave it alone for a full 24 hours for best results. Wipe the surface clean with warm water and a washcloth the following day and your stain should be a thing of the past.