Use only warm soapy water to clean the chair. Use a hard-wrung cloth and dry immediately with a soft dry cloth. If the surface wood dries out, you can restore it to its original shine using rapeseed oil. Apply a thin layer of rapeseed oil on the product, dry immediately. It is likely that after this, the wood will take on a slightly darker color when oiled. If in doubt, consult a specialist, who will advise you on how to care for the wood.