Continue to keep rubbing until you have taken out every one of the dry or calloused skin in the region. When you're completed, rinse from the pumice stone and use some moisturizer to the skin. For recommendations on caring for your pumice stone so it lasts for a longer period, https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/