Grout haze

Our tiler used chocolate grout on choc tiles and before it dried was perfect color. Now it has dried it has gone whitish. He said it would go away or wear/wash off in time but I'm concerned about it, now there is plaster dust all in it and is now totally white.

What's the best way to clean it back to the original choc color? Apart from the plaster dust would it have been the 'salt' making it white when it dried. Is this likely to continue to come out?


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