How to remove cement grout from tiles

We have recently had a mock slate tile floor laid in the bathroom. The grey cement that was used, has left a residue in the texture of the tiles. We have tried scrubbing it with cleaning products as well as 'HG Hagesan cement grout film remover' but to no avail. Any other suggestions?

Reply to
Pumelke
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Cilit Bang - Honest!

Reply to
Dave Jones

hydrochloric acid brick cleaner will eat it, but Ive no idea whether it will eat the tiles as well.

NT

Reply to
meow2222

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