Reddit reviews Korkay Concrete Remove and Cement Dissolver - 1 gallon
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Bio degradable NON Acid formula MIX WITH WARM WATERCompletely dissolve the cement to produce rinsable mudRemoves: Concrete Morter Grout and Stucco LESS than 6 months oldPerfect to Prep Concrete for Etching, Staining or Epoxy application
I don’t know what other products are available to remove grout, without getting the product on the wall to which the tiles have been adhered, but this is one of them. It will soften the grout up, and you can then remove it with the same towel that was used to apply it or a perhaps another or a sponge.