Hi everyone. Extremely boring question but I'm slightly tearing my hair out. Recently moved into a new flat - the bathroom has beautiful wall to ceiling slate tiles. Looks fantastic but what the hell do I clean them with? Slate is porous & can't handle bleach, vinegar etc. I live in London so the water is hard too & they're getting duller by the day. Does anyone else have this problem? What do you all use?
curses the previous owners who thought they were a good idea