Bathroom Renovation Problems - grout removal

The owner of the property whose patio was grossly stained with grout during bathroom renovations has been trying to obtain fair compensation from the contractor responsible, but so far the offer made is considered quite inadequate.

What would you say was fair compensation for a brick patio changed from this to this, by grout spilt and ignored by the bathroom renovation team?The owner has spent many hours of his own time and several hundred dollars on phosphoric acid substitute, to clean off the worst of the grout, as reported in earlier blogs. Yet the renovator responsible has offered little more than to repay the cost of the materials used! If there is no improved offer, the owner will be applying to the local court for fair compensation.