Coffee Stains Note: Works for stains up to a day old. Supplies White vinegar Baking soda Towel Soft toothbrush Instructions 1. Soak a towel in white vinegar, and use it to gently blot the stain using a dabbing motion (do not rub). 2. If the stain has been set for a while, cover it with baking soda, then gently brush with a toothbrush. 3. Launder in cold water.