Antique pianos are regarded as precious instruments. Therefore they need an elaborative maintanance in order to preserve it’s attractiveness and protect it against weathering effects of years. Maintaining an antique vertical piano is a difficult job. You should be careful when you clean dusts and you should make sure you do not use any chemical cleaning product that could harm it’s surface.
When they need any renovation treatments, you should hire a professional to handle it. Since they are precious products, you should be careful when doing any maintenance work. Otherwise you may damage it unintentionally.