Many years back we were tiling an area in a new shopping mall and a death in the family we let the haze set for ~5 days, we tried normal scrubbing but it was solid. We ended up using a weak muratic acid solution on the tiles just getting them slightly damp letting sit for a few minutes then wiping and rinsing with water it turned out great and this was a large area +500 1' tiles and you could not tell the difference from the previous section or the later ones when the job was done. Since then I have used. A dilute muratic acid solution ~5-10% by volume to water, it makes the cleanup much easier.
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