Bathroom Renovation Problems = grout removal

When the grouters were working in the property we have been discussing (see blog Nov 15 and others), they set up their equipment on a tarpaulin on the patio. When they left, taking the tarpaulin with them, there was grout everywhere, except where the tarpaulin had been.
The owner complained, and nothing was done for about five weeks, then the grouting team returned and spent a couple of hours with a high pressure cleaner, which had no effect other than to spread the white gunk over the clear area where the tarpaulin had been.
The owner is still discussing this with Oxford Bathrooms, the company that did the renovations.