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Patio slabs during a cleaning project by OOR External

Professional exterior care

Patio Cleaning for Sandstone, Porcelain and Concrete Slabs

A patio is often the first surface to turn green, because it sits in the shade of the house and stays damp after rain. OOR External cleans patios by first working out what the slabs are made of, then choosing how much pressure, if any, the stone can take.

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Patio slabs during a cleaning project by OOR External

Professional Patio Cleaning

Searching for patio cleaners near me usually starts with a slippery step outside the back door or slabs that have gone dark and blotchy. Jordan Sartain looks at the slab type, the condition of the joints, the fall of the patio and where rinse water will go before agreeing a method. Some patios suit a controlled jet wash. Others, especially softer natural stone, are better treated at low pressure with a cleaning solution given time to work.

  • Slab type identified before cleaning
  • Black spot and green growth treated, not just rinsed
  • Joints checked and any weak pointing flagged
  • Rinse water kept away from doors and beds

Sandstone, porcelain and concrete need different handling

Indian sandstone is the most common natural slab in Kent gardens. It is fairly soft and has a riven face, so aggressive pressure can lift the surface layer and change the colour. A gentler pass, or a soft wash with dwell time, protects the texture.

Porcelain is dense and does not absorb much, so dirt tends to sit on the face and comes away readily. The joints between porcelain tiles are usually the weak point, and they are watched closely during the clean.

Concrete and reconstituted slabs are tougher and normally take a controlled jet wash. Older concrete can still be surface worn, which is why the condition is checked first rather than assumed.

  • Indian sandstone and other natural stone
  • Porcelain paving
  • Concrete and reconstituted slabs
  • Steps and edging around the patio

Black spot on patio slabs

Those small black dots that will not shift with a brush are usually lichen rooted into the stone. A pressure washer on its own rarely removes them and can damage the slab trying. Treatment is applied and left to work, then the patio is rinsed. Biocide treatment can be added as a separate line to slow regrowth, and how it fits your patio is explained before work starts.

Joints, pointing and re-jointing

Cleaning shows up the state of the joints. Mortar that is cracked or missing, or brush-in compound that has softened, becomes obvious once the growth is gone. Any weak pointing is pointed out before the clean, so you know what to expect and can decide whether re-jointing is something you want to arrange.

Patio and driveway together

Many homes book the patio with the front drive, which saves arranging access twice. The driveway has its own page because block paving and tarmac raise different questions, and both sit under the wider pressure washing service.

Patio problems and prices

Black spots on patio slabs

Patio cleaning cost guide

Green growth on slabs

Moss and green algae on patios

Patio Cleaning FAQs

What should I use to clean my patio?
It depends on the slab. Concrete can usually take a controlled jet wash, while sandstone and other natural stone are better cleaned at lower pressure with a treatment given time to work. Avoid strong acids on natural stone, and test anything new on a hidden corner first.
Will jet washing damage my sandstone patio?
It can if the pressure is too high or the lance too close, because sandstone is soft and the surface can lift. That is why the stone is identified first and the pressure chosen for it.
Can you remove black spot from patio slabs?
Black spot is usually lichen rooted in the stone. It is treated and given time to work rather than blasted off. How much fades varies with the stone and how established it is, which is discussed before work starts.
Do you re-point patio joints?
Joints are checked as part of the job and any weak or missing pointing is flagged before cleaning, so you can decide on re-jointing. Ask about it when you request a quote.

Related Guides

Black Spots on Patio Slabs: Causes and Removal

What black spot on patios is, why it appears and how it is treated on different paving materials.

Patio Cleaning Cost: What Shapes the Price

The factors specific to patios that drive a cleaning quote, from stone type to black spot treatment.

Moss on Patio Slabs and Green Algae

Moss on a patio usually arrives with a green film of algae, spreading from the shadiest corner until the whole surface is slippery.

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