Q: The marble threshold for my shower has reddish marks. How can I remove them? Annapolis, Md. A: Marble can develop reddish marks for a variety of reasons, such as spilled red wine, bacteria or ...

I renovated my bathroom about eight years ago and put expensive marble tile on the wall above the bath. I now have some black mould growing in the cracks between the top of the bathtub and the tiles.