Main body of the bath steam-bent in olive ash with a brick-built walnut roll-top rim and walnut base. There is no regular required maintenance other than cleaning. No oil, or finish to be re-applied. To not disrupt the sheen & clarity of the final finish, we recommend just soap and water for cleaning with no grit-based cleaners or abrasive sponges. However, we have tested our baths with many heavy-duty bath cleaning products with no adverse effect.