A good way to clean up any stray nail polish after your pedicure is with a cotton swab soaked in polish remover. Take care to look closely and clean up the transparent base- and topcoat polish, too. Then be sure to wash your feet thoroughly, since leaving the polish on can dry out your skin.
Your pedicure won't last forever, now matter who does it; expect that you'll need a new one every week or two. You can prolong its beauty, freshen the color, and prevent chipping, however, by moisturizing your feet daily, and by replacing the topcoat of clear polish every day or two.