Key Ingredients and Their Functions

A "whitening" scrub for hands and feet would likely combine physical exfoliants with skin-brightening ingredients.

Exfoliants: These are the key to a scrub's function. They could be natural or synthetic:

Sugar or Salt: These are common physical exfoliants that dissolve in water.

Walnut Shells or Almond Meal: Finely crushed particles provide a natural, granular texture.

Pumice Powder: A gentle but effective volcanic rock powder used for tougher skin on the feet.