Depending on the size of the stain, mix one part of the dish soap with two parts of the hydrogen peroxide in your choice of the jar or plastic container. Make sure all the peroxide is thoroughly mixed into the soap.
Add about 1 Tablespoon of baking soda to the soap mixture and stir. Continue adding little dashes of baking soda until your mixture has a paste-like consistency. If you accidentally make it too thick, just add a little more hydrogen peroxide to loosen things up again.