Patio pressure washing

Patio Cleaning Ipswich

Slabs, concrete paving, sandstone and porcelain cleaned at a pressure the material can take — with treatment where marks will not simply wash off.

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Patios go green quietly. A patio that gets shade for part of the day, sits under a tree or backs onto a fence will hold moisture for most of the Suffolk winter, and that is all algae needs. By spring the stone looks grey-green, the joints have moss in them, and the whole area is slippery underfoot in the mornings.

Surfaces and materials

  • Paving slabs — riven and smooth concrete slabs, the most common patio surface locally.
  • Concrete paving — including older utility paving, steps and paths joining the patio.
  • Indian sandstone — soft, porous and easy to damage with too much pressure.
  • Porcelain — dense and straightforward where the tiles and joints are sound.
Sandstone patio half cleaned, showing black spot lichen and algae on the untreated half

Method depends on the material

A concrete slab patio will take a firm, even clean with a rotary surface cleaner. Indian sandstone will not. Cleaned too hard, sandstone loses its outer skin, goes slightly furry and then soils again far faster than it did before — the patio looks better for one season and worse for the next five. So the nozzle, pressure, distance and pace change with the material, and condition matters just as much: hollow slabs, failed pointing and cracks are checked before anything starts.

Why some marks need treatment, not more pressure

Surface dirt, algae and moss sit on top of the stone, so water shifts them. Black spot does not. It is a lichen that bonds into the pores of the stone, and its holdfast sits below the surface you can see. You can hammer it with pressure and mostly succeed in eroding the stone around it, leaving pale pitting and the spots still visible.

The sensible route is a clean first, then an appropriate treatment left to work, then a rinse — and in bad cases a second visit. Rust marks, tannin staining from leaves, and paint or cement residue are also treatment problems rather than pressure problems. We would rather explain that up front than promise a patio will look brand new and hand you something patchy.

Shaded and awkward areas

Side passages, north-facing patios, areas under washing lines and the strip beside a garden wall are the spots that go green first and come back first. Cleaning them is easy enough; keeping them clear is about light, drainage and how often the area is used. If a patio has no sun and poor drainage, a realistic expectation is a good clean each year or two, not a permanent fix.

Ipswich gardens

Rear patios across Stoke Park, Chantry, Holywells and Rushmere are often 1970s–1990s concrete slabs with settled joints, while newer gardens around Kesgrave, Martlesham and Whitehouse tend towards sandstone and porcelain. Both get treated on their own terms.

Before & After

Patio Cleaning — Before & After

Typical before-and-after examples, not photographs of specific completed jobs.

Grey concrete paving slabs covered in algae and organic build-up before cleaningBefore
Grey concrete paving slabs after cleaning with the natural surface colour more visibleAfter

Paving Slabs

Paving slabs with algae and organic build-up in a shaded patio area.

After cleaning, with the natural grey surface colour more visible.

Indian sandstone patio with dark patches of black spot lichen and algae before cleaningBefore
Indian sandstone patio after cleaning with more of the natural stone variation visibleAfter

Sandstone Patio

Sandstone with dark patches, algae and organic growth.

After cleaning, with more of the natural stone variation visible.

Treatment can significantly reduce black spot, but results depend on the surface and how deeply the growth has established.

Before you decide

Patio questions

Read the full Before You Decide guide

Related work

Patio looking green or slippery?

Send a photo or two and your postcode. We will tell you what the surface likely is, what will come off and what may need treating.

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