Is there a safe way to remove this dried grout?

Is there a safe way to remove this dried grout? Images

Is there a safe way to remove this dried grout?

Is there a safe way to remove this dried grout? Description

I recently had Carerra Marble flooring installed in my bathroom and (http://maplered.com) the installers were rather messy.  It seems there is still some grout left on the actual Marble (http://www.lightemprador.com) Tiles (http://www.g682.net) .  Is there a safe way to remove this dried grout without harming the floor?
Thanks in Advance, Gina, USA.

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