My tile setter used windex. Porcelain tile though, not on natural stone.

The container tells you what to use. I think it is a diluted vinegar. Our installer carefully followed the directions on the package and it was the neatest, best, easiest install that he did for us. He used two other types of grout in different installations and they were both messier and had haze to deal with. But not the Laticrete Spectralock. If I ever have anything grouted again that is what will get used.

Thanks, mic, that is great news! We are taking a break from ripping out the old tile right now. So. Satisfying!

What kind of tile are you putting in? I put ceramic in and had no problem with a haze, following the cleaning instructions. I have a marble strip (listello) and slate floor that I used spectralock on as well. With both, I used a stone sealer first, being careful not to get the sealer into the grout spaces. The sealer is supposed to act like a grout release. I had no haze on either of these stones, following the instructions in cleaning, that spectralock provides.