[churchyardchild]

I have a new wardrobe, the shelves are white and the coat is really glossy but I wouldn't know the material or products used to make them. I tried to wipe them down with a damp cloth but that just created black spots and I haven't tried to get rid of them to avoid ruining it further. The first picture is what I need to fix and the second picture is what the rest of the shelves are like and how it's supposed to be. Does anyone know how to fix this?