Pour baking soda into a bowl. Add just enough liquid soap to make a creamy paste. Spread mixture on the flat side of lemon and scrub. The lemon acts as a sponge and leaves a natural citrus scent. Use a damp rag or sponge to wipe away any residue. You'll find the paste will stay moist for a few hours.
Helpful Hint To save leftover scrub, add in a few drops of vegetable glycerin (a thick, clear syrup derived from plant oils, available from mountainroseherbs.com) and seal in a glass jar.