Pressure Washing Service

Sandstone is not one colour. A single patio can run through buff, honey, grey, rust and a soft pink, and those tones sit in the outermost skin of the stone — a layer thinner than a fingernail. It is why a good sandstone terrace looks like one thing at eight in the morning and something else entirely at sunset. It is also why a careless clean is so quietly destructive: strip that skin away and you remove the exact quality the stone was chosen for.

A patio is the wettest surface a house owns. A wall sheds water in seconds; a horizontal flag holds dew until mid-morning, holds rain in every joint, and sits in the shade of the building for half the day. In building-science terms its time-of-wetness is far higher than any elevation on the property, and moisture is the one thing biological colonisation needs above all others. Patios do not green over because they are neglected. They green over because they are flat.

The black spots that survive every brush are not marks; they are crustose lichen, and they are anchored rather than resting. A lichen of that type grips by chemistry, working into the surface layer and holding through anything a stiff broom can offer. That is why scrubbing shifts the green algae but leaves the black exactly where it was, and why there are only two honest options: release the anchorage chemically, or take away the stone underneath it.

So the order matters more than the machine. A biocidal pre-treatment goes on first and is given time to work, breaking the organism's hold while the pressure is still switched off. Only then does water get involved, and its job is simply to carry away what has already been released. Reverse that order and the pressure has to do the entire job on its own — which is precisely the moment the surface starts coming off along with the biofilm.

A rotary surface cleaner is the difference between cleaning a patio and eroding one. It spreads a fixed flow across a wide sweep, so no single point of stone ever takes the full force, and it holds a constant height and distance that no human hand can match over an afternoon. A lance with a turbo nozzle can do more harm in ten seconds than a season of weather — so here it came out only for spot work, at the lowest setting that would lift anything at all.

The joints matter as much as the flags. Concentrated pressure washes out jointing sand and mortar, and an open joint becomes a small reservoir that feeds the next colonisation from underneath — so a patio blasted clean in April is often greener by autumn than one cleaned gently. Distributing the flow keeps the joints where they belong. The brick edging was treated as its own substrate, softer and more absorbent than the paving, and cleaned to the same chemistry-first standard rather than swept along with the rest.

The last pass is the one nobody sees. A residual biocidal treatment goes down after the water has gone, so the stone is left hostile to the organisms that have just been removed rather than freshly cleared and freshly available. Without it, a patio is simply a clean, damp, open surface with every spore in the garden heading for it. That final step is most of the difference between a terrace that looks right for one summer and one that holds its condition through a full British year.

This one sat with open farmland behind it and nothing between the terrace and the horizon — the kind of garden that earns its stone. Full exposure means full dew, full rain and full light: hard on a surface, and glorious to stand on. Bringing the colour back to a patio like that is less a cleaning job than handing someone back a view they had slowly stopped noticing.