Yes, I know this is as Dear Facebook as it gets, but I need help from the onboard chemists. No matter what I have tried, I have some grout that won't come clean. It was grey, and it has turned tan in spots. The anal retent in me is driven nuts by this. Besides needing a respirator and a hazmat suit, is Muriatic Acid a terrible idea? Will it eat the tile?
I don't want to make an expensive mistake.
I don't want to make an expensive mistake.
