Our contractor didn't do a good job installing the Quartizte wall tile, and left a white thinset film on all the tiles.
: https://i.stack.imgur.com/QVjgc.jpg Wall Tiles
What we have tried:
- Vinegar: It seems to help a little but no real progress
- Nylon Brush bits for Drills: brushing away the thinset. Has helped a bit but again no real progress.
Are there any suggestions how we can remove this?