We like this recipe for a nontoxic bathtub cleaner from this month's issue of Natural Home magazine: Silky Scrub 1 cup baking soda into a medium-size mixing bowl 1/2 cup castile liquid soap 5-10 drops of antibacterial essential oil, such as lavender, tea tree or rosemary (optional) 1. Pour baking soda into a medium size bowl. 2. Add soap a little at a time, stirring continuously. Stop adding after your mixture has begun to resemble frosting. 3. Mix in drops of essential oil. 4. Store in an airtight jar for up to a year.