Hi just a few days ago some paving guys came to re point the pool capping around our pool. The aftermath is not a great finish and they have left cement patches on the face of the pavers, which are quite porous. They are coming back to jet wash them clean. Can I have advice on whether or not they should be using a chemical too and if so what type, and will a high powered key washer actually work? I'm quite upset with the result so far.. thank you


