stains on tiles in new build

[notryan]

Hi, we have recently had handover of our build and the tiles appear to have some kind of water staining to the top, could this be grout? Or adhesive? Nothing seems to be able to get rid of it in the general cleaning category and it also seems to be water repellent. Please see photos for example.

The tiles are atlas grey Matt from National Tiles,

The grout is Mapei Ultra colour Plus - Anthracite and I believe the adhesive was a Dunlop one I believe the green bag the Mastic one.

Thanks