Honed marble shower and rust stains
My shower stall has a wall of honed white marble mosaic.
Our home was uninhabited for about 18 months during reno. We have well water that is treated extensively (our basement looks like a mad scientist's lab). At some point the water became rusty. The shower wall now has a rusty hue where the shower water hits it.
Have you had success removing rust in this situation (I have already googled and learned about lemon, vinegar, baking powder, etc. .... but I am wary about some of this info; doesn't acid etch?)
Thanks in advance.