Nail brushes are useful for removing dirt, and keeping nails and cuticles clean; they also can be used to exfoliate hands and feet!
 
How To Use
Lightly wet your nails or nail brush and, in a circular motion, gently scrub the tips of your nails and the skin around them. Rinse hands and pat dry with a towel. 
 
Keep your nail brush clean by washing it with water and a soap, or with a makeup brush cleaner.