The beauty of using this deep-cleaning scrub for countertops, showers or bathtubs says Karyn Siegel-Maier, author of "The Naturally Clean Home: 150 Super-Easy Herbal Formulas for Green Cleaning", is that it will soften your hands as you clean. Combine ¾ cup baking soda, ¼ cup powdered milk, 1/8 cup liquid castile soap and 5 drops of lavender essential oil into a squirt bottle and add enough water to make it a smooth paste. Shake or stir to mix. Apply to surface and then wipe area clean with a damp sponge or cloth. Rinse well.