I have a client with a black grand piano. Most piano‘s I clean I use water and polish with a microfiber cloth since the finish can‘t handle most products.Well, this household loves it‘s fried food and there is a layer of grease or some kind of film that won‘t come off with just water. I can‘t afford to ruin the finish, but it needs to be cleaned. What would you recommend I use to get this film off?Thanks!
