I just moved into a new condo that no one has lived in. But for some strange reason, the bathroom floor is discolored. I am not 100% sure what material the floor is, but it's some type of brown tile. And it has this whitish coat/residue all over it so it looks like a construction site. When trying to wipe it off, the floor looks like its original color while wet, but goes back to that whitish look when it dries. What can I try in this case? I was considering some type of solvent but I'm not sure if that's a good idea. Thanks so much in advance!