I mentioned the other day that I was cleaning some paving up with the pressure wash. There is always an issue doing this with the pressure of water damaging the pointing. In this case there wasn't any pointing left so not so much of an issue. There wasn't any pointing since the paving had been cleaned this way a few times before. However my customer did observe that each time it was cleaned the paving seemed to get dirty(er) quicker. I wonder if the water lifts off a smooth finish from the casting, leaving the surface a little rougher and therefore more susceptible to gathering grim? Any thoughts? 
These pictures give some idea of how dirty the paving was, it looked pretty much black or at best a dingy dark grey, after cleaning you could tell that this was in fact a pattern of green and light grey slabs. Generally I am not a fan of coloured paving slabs, but in this case I have to say that a lot better clean than dirty.
The rather yawning gaps between the slabs where they may once have been pointed showed up like a missing tooth in a pretty smile, since the slabs have become pretty uneven I thought the best thing was to just sweep some sharp sand intro the cracks. I suspect that the ants will soon lift this but it looked a lot better in the short term.
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