Backyard paving on Alston Grove that had gone years without a clean. The surface had darkened to the point where the original colour of the tile was no longer visible. Cleaned in two stages: a cleaning solution first to break down what had grown into the surface, then pressure to lift it out.


Pressure alone is the wrong first move on heavily soiled paving. Grime on outdoor tile is mostly organic growth that has taken hold in the pores of the surface, not loose dirt sitting on top. Hit that with high pressure straight away and the growth is driven deeper while the surface itself starts to erode, which makes the paving soil faster from then on.
A cleaning solution went on first and was left to break down the organic layer, so the pressure stage had something loose to remove rather than something bonded to fight. Working in that order means the pressure does less work and the surface takes less punishment. The paving was then rinsed down in sections and the run-off kept away from garden beds.
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