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Our contractor didn't do a good job installing the Quartizte wall tile, and left a white thinset film on all the tiles.

[1]: https://imgur.com/a/fwHJ5 Wall Tiles

What we have tried:

  1. Vinegar: It seems to help a little but no real progress
  2. 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?

2

If you are reasonably careful you can pick up a bottle of muriatic acid (the trade name for HCL) at the hardware store. Dilute it according to the instructions and gently scrub with a nylon brush. The acid will dissolve the mortar while leaving the quartz.

It goes without saying that reasonable care includes not using excessive amounts or spilling it on any cement-based surfaces you're worried about etching. I'd suggest working from a pail with a brush so you don't apply too much. You'll see bubbles in the acid while it's reacting with the mortar which will slow and cease as the pH normalizes. Then you can wipe down the tile with a damp cloth and move onto the next.

  • This is the best answer for the scenario. A pain to deal with using muriatic acid is the only option without having to replace all the tiles. – Sheraz Nov 12 '17 at 22:00
1

If the vinegar did not help, use an undiluted grout cleaner and a scrub brush.

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