Allow the stone to dry By itself. Set it inside a dry spot far from moisture to avoid microorganisms growth. Desire a further clean? Delponte suggests spraying pumice stones with 70 percent Alcoholic beverages to be sure there is no chance of bacterial growth. Celeste Hilling, founder and CEO of https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/