Though the grout had to be up today as well so didn't mention it but a concrete scabbler (concrete plane) will make light work of it and leave you with a level surface.
Good shout. I'll try the sharp blade scraper first and then move on to the big tools if that doesn't work.
@deleted started
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Though the grout had to be up today as well so didn't mention it but a concrete scabbler (concrete plane) will make light work of it and leave you with a level surface.