The grout looks somewhat better. There is still a silver haze over some and some areas showed no change. I texted Hugo at American Floors Inc to let him know. When he arrived at the house he brought an additional worker and said he would try rubbing the grout with dry towels to get the grout cleaned.
They spent all day rubbing lines of grout with a dry towel. Meanwhile, another worker repeated another scrub in the bedrooms with vinegar and water solution.
What an absolute disaster ! We will see what the results are in the morning again!