The cell membrane's main trait is its selective permeability, which means that it allows some substances to cross it easily, but not others. Small molecules that are nonpolar (have no charge) can cross the membrane easily through diffusion, but ions (charged molecules) and larger molecules typically cannot.
Remove dead skin from hands and feet. The basic way to exfoliate hands and feet begins with keeping them in warm soapy water for at least 15 minutes. You will notice that your skin has become ultra soft. Now the time begins to exfoliate your hands and feet. Apply the scrub to skin and rub it for 15 minutes.
1 Pour all liquid ingredients into the plastic tub. 2  Sit down. 3  Place feet in tub and relax. 4  Wait for a period of half an hour to one hour. 5  Add more warm water if you wish. 6  Remove feet and use a loofa to get rid of dead skin.  Rinse and dry.