METHOD FOR MANUFACTURING DISHWASHER/DRYER

Provided is a method of manufacturing a dishwasher provided with an inner wall made of a stainless steel plate having a hydrophilic coating with durability against an alkaline detergent and sufficient durability against an acidic detergent on the surface. The method of manufacturing a dishwasher of the present invention includes steps of: forming a first layer containing zirconium oxide and silicon oxide on a surface of the inner wall at a heat treatment temperature of 200°C or higher; forming a second layer containing an oxoacid on a surface of the first layer at a heat treatment temperature lower than the heat treatment temperature of the first layer; and obtaining a thin-film layer containing zirconium oxide and silicon oxide on the surface of the inner wall and having a contact angle of water of 20 degrees or less on the surface, after removing the second layer by using a washing method, in which the first layer contains the zirconium oxide in an amount of 80 mass% or more in terms of oxide and the silicon oxide in an amount of 1 mass% to 20 mass% in terms of oxide.