The concrete drive for our new house was poured in May this year. The driveway has not yet been sealed.
In mid-November, bricklayers working on a house next door tracked a lot of heavy clay mud onto our driveway. By the time the bricklaying was finished the mud had dried and hardened.
The workers tried to remove it with water and a broom but that didn’t work. They then brought in a pressure washer and, using a narrow, high pressure spray, were able to remove the mud.
Unfortunately, when the driveway was dry we discovered that the spray had left marks all over the parts of the concrete that had been mud-covered---as though someone had used a stone to draw designs.
The man who poured the driveway has checked the marks. According to him there is no sign at all of spalling. He said that over time the rest of the topmost layer of the concrete will wear away and the markings will not be noticeable.
We would rather not live with unsightly markings until that happens and the bricklaying contractor is prepared to do what is necessary to bring the concrete back to its original state.
We have had a number of suggestions about how to remove the markings and would appreciate any comments or recommendations on them:
1. The man who poured the driveway suggested using a dilute solution of muriatic acid, saying that it would hasten the removal of the topmost layer of the concrete.
2. Someone suggested using a rotating fiber brush, working across the driveway to preserve the ‘brooming’ ridges.
3. Another person suggested using a darkish sealer (the markings are not very noticeable when the concrete is wet).
4. Yet another person suggested ‘painting’ the concrete with a thin mixture of water and cement to cover up the markings, and when dry, sealing it.
We live in Ontario Canada and winter has arrived so we will not be attempting any repairs until the spring.
In the meantime, we would really appreciate any advice.