Removing graffiti on stone, tile, brick, or masonry? Put the pressure washer away. It can be problematic and/or ineffective. Read this article for guidance.
This article offers sound advice on how to disinfect your natural stone without accidentally causing etch damage and what to do if you already have etch damage.
Have you ever noticed a slimy pink film form in your shower? This article explains what it is, how to get rid of it, and how to keep it from coming back.
Is the stone around your shower drain darker than the surrounding stone? The cause may be clogged weep holes. The solution may be an easy DIY procedure.