I have installed 12X12 ceramic floor tile with a rough finish.The glaze is sandy. Last night I had my helper mix the grout and we started to lay it down. Never the less my helper (rotten son) walked off the job and left me holding the trowel.(Yes we were arguing) So you can imagine how the floor looks. I managed to get the grout all down and I spent hours cleaning and cleaning and cleaning but to no avail - there is a grout haze. Please help me, what do I do to get the beautiful look of the tile back.