Firstly, use a stiff broom to remove any debris. Then clean the patio with a suitable cleaner such as Centrecoat R09 Heavy Duty Cleaner. If your patio has moss or algae growth, we recommend using Centrecoat GS36. However, if you intend to use a jet wash, allow to dry thoroughly before application of the paint. If you patio slab has algae growth that is not removed by the Centrecoat GS36, we would recommend the use of Centrecoat BG R04 Hard Surface Landscape Cleaner. Application: How Do You Paint Old Patio Slabs? The Patio Magic Mould & Algae Killer is one such product. This concentrated patio cleaner continues to remove the regrowth of green mould and algae, even if you applied the product months ago. Always follow the manufacturer guidelines for use and wear protective clothing and goggles when using patio cleaners as they contain harsh chemicals. Take care in case of splashes and dispose of waste thoroughly after use to avoid harm to humans or the environment.

It doesn’t require rinsing off, scrubbing or pressure washing, although if you have lots of moss then you may still need to gently remove it with a brush. You should take care when using this product, as it’s highly toxic to aquatic habitats. You should also take care not to spray it near plants. Apply in dry conditions when no rain is expected for up to 8 hours but you should also avoid applying it during intense sunlight. Connect your pressure washer to water and power. 'A pressure washer uses lots of water at high force, so you’ll need a constant supply of water if you want to get the job done well,' says Fiona, MyJobQuote. All surfaces must be dry and sound and free from any oil, grease, treatment debris and algae. New concrete must be left for 4 to 6 weeks prior to treatment. For small items such as gravestones etc, N-Virol Algae & Lichen Killer solution may be applied by a brush provided the solution is flooded generously into inscriptions and other cavities

Lemon Juice - genuine lemon juice, fresh from a lemon, not from a bottle or a plastic imitation lemon. Squeeze directly onto the stained area, allow it to react for 5 minutes or so but don't allow it to dry out. While still wet, scrub the stained area with a nylon/polypropylene bristled brush (an old toothbrush is ideal), working the lemon juice into the surface of the paving. Wash off with plenty of clean water after 5 minutes and repeat as necessary.

The easiest way to clean concrete depends on how dirty your patio has become. For speed and ease, a pressure washer is your best friend, but they are expensive and bulky to store. They can also cause damage to pavers and joints if used to aggressively. Pre-wet the whole of the pavement with clean water. Before the surface dries, spray with the prepared cleaning fluid (or brush with the fluid) and use a stiff brush to gently scrub the whole surface. Step 2: Pour the solution over the area you want to clean, and try to avoid pouring it over any plants and flowers Whichever you choose, it’s important to follow the instructions and use appropriate protective clothing. And, depending on the solution, you might have to keep pets indoors for a period of time.

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This cleaner generally works very well and marks good value for money. It has a recommended dilution rate of 1:5 with water, and it can also be applied neat if needed. For less affected areas, opt for a dilution rate of 1:10. Users have also reported needing to use a wrench to open the lid, as it’s quite difficult to get into. This might be an important consideration if you have mobility issues in your hands. To optimise the effect of N-Virol Algae & Lichen Killer solution, it is advisable to abrade the face of such growths prior to treatment. (E.g. stiff brush) Plus, it can also be used to treat mouldy walls and fences before painting them, removing mould that would otherwise ruin the finish of the paint. So, if you’re planning a big garden spruce up, this multipurpose patio cleaner could be incredibly helpful. In the photie above, old, reclaimed yorkstone flags from the streets of East Lancashire have been brought up like new by blasting with grit to remove all dirt and surface staining. One of the modern, portable surface blasters used to clean badly stained pavements

You can apply the stain over worn concrete, but don’t expect a miracle. You’ll still be able to see the old appearance through the stain. And avoid staining spalling concrete. The stain will turn a darker color wherever the concrete is pitted. Read on to learn more about this project, one of our favorite simple concrete patio design ideas. What is concrete stain?

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A further handy tip for heavy staining is to pre-wash the affected paving with "OxiClean", a product more normally associated with domestic laundry.