[wwwaskm]

I all,

I have a polished river stone floor in my shower, with black grout, problem is, it has a white haze from the water. I would like to know how to bring back the deep black that was originally the grout color. Is there a superior cleaning product? Have any of you had luck cleaning grout in the shower area. Thanks for any advice!

[ballengerb1]

Try CLR which is in the laundry aisle at most grocery stores and hardware store.

[foxrocks]

Your problem is minerals leaching out of the grout, this is a coman problem with cement.
I use different grouting tricks to avoid this but there are different (efflorescence) removers out there look at the hardwhere store