Thanks for reading this! Our tiled shower had spray refinish sprayed all over it 8 years ago. The guy then immediately disappeared. Before long it started cracking and peeling. Underneath are some strange black marks that didn’t come off with Comet or Magic Eraser. Eventually it’ll have to be redone but this isn’t a good time. Suggestions? My biggest concern is removing the weird black loopy marks. They look almost like something was being buffed in a circular motion. Thanks!