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.
For really hard skin use paraffin based jelly such as vaseline cover your feet in it and soak them as above, when your feet are soft enough use a scrub to massage your feet and to remove dead skin. Soak again for 10 to 15 mins and rinse off. You can now use a foot file to take off more dead hard skin around the heels.assage your feet with a moisturizing lotion. Use an exfoliating lotion if the skin is dry and/or roughened. Use a loofah or pumice stone on roughened areas. 7. Separate your toes. Put cotton between your toes, or use a ready-made device for pedicures.