Wood is a living material that changes subtly over time. All wood reacts to sunlight, moisture, and temperature, so the grain and color may vary slightly. When cleaning, use only warm, soapy water and dry immediately with a soft cloth. The chair is oiled. If the surface of the oak wood dries out, it may be possible to restore its original luster by applying flaxseed/linseed oil to the product. Carefully follow the instructions on the label or consult a specialist.