Most essential oils can be diluted and used in a bath, allowing you to relax and soak in the nutrients and health benefits they have to offer. However, there may be occasions where some of the residue of the oil is left on the bath after the water has drained away, especially on lighter designs. To remove essential oil stains in a bathtub, try the following: 1. Mix equal parts water and baking soda to create a paste and apply this to the stained areas with a cloth using circular motions. Let it rest for 5-10 minutes before washing away (do not try this method on natural stone baths). 2. Two parts white vinegar with one part water mixed in a spray bottle can be applied to the stain and left for 15-20 minutes. Wash away to see the results (do not use this on porcelain baths). 3. Alternatively, you could mix one part hydrogen peroxide with two parts baking soda. Apply using a cloth and leave for 5-10 minutes before washing away. Always wear clothes when using this method as hydrogen peroxide is particularly abrasive.