Only epoxy grout is "waterproof", and technically, even it is not if you want to get down to actual perm ratings. Porcelain tile is not technically waterproof either, it just has a very very low perm rating. ZERO grout is stain proof. It is stain resistant., not stain proof. The best way to keep your grout looking clean is to find flooring the color of that dust, and use a grout color to match. Terra cotta tile comes to mind immediately.

Not what I wanted to hear 😕 I have this vision of blond color flooring with stain proof grout 😆😆

I used epoxy grout in my son’s bathroom in our last house. I never had any issues with staining and it always looked clean (very light beige grout). I used a similar color in Custom’s fusion pro in a rental home 7 years ago. It still looks amazing and we had some filthy tenants in there at one time. I mean you can’t even imagine how bad it was. I was able to clean the grout very easily with baking soda, peroxide and dawn soap. No staining. I would bet that you can stay on top of it with regular cleaning. Make sure you’re using clean mop water.

Thank you. It does sound possible. My daughter in law and my grandson are coming over in a couple of weeks. I'm going to ask her to bring a few light colored epoxy grouting. I could get a few tiles and test them out. Sounds like it's worth trying.