Hand wash before use. Hand wash carefully in warm water with mild detergent. We do not recommend harsh cleaners should be used on you new marble pieces. The Marble is sealed, however please note food or drink residue will naturally stain the marble. Marble is a porous stone, so its surface will naturally absorb any Items such as food oils, dark liquids or other liquid forms. Dark or colourful food items, colourful herbs and spices will naturally over time stain the surface of the marble. This is a characteristic and naturally beauty of the material, and is not a fault.