Does anyone know how I might get my green colored grout clean again? In my master bath floors, I have green tile with green grout and I used some solution (I forget now) on it and it left a whitish, cloudy color over the green. I scrub and scrub and while wet, it looks new again. then when it dries, it is back! Please, if anyone knows what I can use to clean it and still keep the color I would be forever grateful! thanks!!