They are clean and have been air dried in winter time but in summer sun and wind dried. We cleaned them to wash off any loose sand, small stones, and sea salt. Some might need an extra cleaning if desired.No chemicals were used. Great decoration at home, for Special nights, events, dinners, Birthday Parties, Christmas Decoration, As Bedside Table Light, Ambient nights in the garden, yard, camping, Restaurants, pubs, shops and more. Hundreds of uses for arts, crafts, hobbies, weddings decorative ideas and general crafting, home decor, pastoral taking pictures of props and so much more Beautiful natural Lake driftwood pieces. Add charm and beauty to your living space, marriage, party, etc.Great for both indoor or outdoor use.