Patio, Decking & Fencing

How To Pressure Wash A Patio Or Decking

Adding a patio or decking to your garden can create a stunning area for entertaining, dining and more. It’s important to clean your decking or patio regularly to prevent the build up of dirt and algae and this step by step guide from the experts at Homebase will show you how. Read on below for our top tips on how to clean decking and patio slabs with a pressure washer…

Using a pressure washer to get rid of all the algae, lichen and moss that’s covering your patio can help you skip the hard work of using a manual scrubbing brush. Their powerful pump and narrow nozzle make pressure washers blast water with a forceful spray. This removes dirt and grime from paving slabs quickly, while using water more efficiently than a normal garden hose.

Which pressure washer do I need?

If you’re thinking about buying a pressure washer, our pressure washer buying guide will help you find the right one to suit all your needs.

How to pressure wash a patio:

Step 1

Clear your patio completely by removing all furniture, ornaments and pots.

Step 2

Using a broom, brush away any loose debris such as leaves and dirt.

Step 3

Connect your hose and ensure that water is running freely before you begin. Allow water to flow through the machine to remove any air locks. Please note the hose should be a minimum of 7.5m in length and ½ inch thick. If you’re using a hose reel, this should be fully unwound and free of kinks to ensure a constant water flow. To connect your hose you will require two universal connectors and a tap adaptor for your garden tap.

Step 4

Connect your pressure washer to the mains electricity supply then turn it on to pressurize the system.

Step 5

Before you start cleaning your patio, you could apply detergent to the surface to help dissolve dirt and make the patio easier to clean. Some detergents also have special properties that will help reduce the build-up of dirt going forwards and will also protect your surfaces from weather damage. Specific detergents are available for stone, wood and vehicles, each with specially designed formulae to suit the task.

Step 6

Some dirt and organisms like lichens can be hard to remove using a standard lance or patio cleaner. Most pressure washers come with a rotary pencil jet nozzle that can provide up to 80% more power. By switching to this lance you can ensure even the most stubborn dirt can be removed. It is important to note that the increased power of these lances means they should only be used on hard surfaces such as stone or brickwork, sensitive surfaces such as wood or vehicle paintwork may be damaged if cleaned with this type of lance.

Top tip:

Jet washing a block paved driveway is not always the best way to clean it as, by its very nature, it will remove the sand that binds the blocks together. If you do use a jet washer on your driveway, the sand needs to be replaced before any substantial traffic is allowed on the driveway as sand binds the blocks together as a mass.

How to pressure wash decking:

To clean decking, you should follow the same process as cleaning a patio. As mentioned in Step 5, there are specific detergents for woodwork available that will protect your decking from UV damage whilst helping you dissolve the dirt. As mentioned in Step 6, rotary pencil jet nozzles are not suitable for wooden surfaces, most machines will come with a variable pressure lance where pressure can be reduced so that they can be used safely on your decking.

Top tips:

  • If you’re using an extension cable, it is advised that this should be no longer than 10 metres in length and have a constant rating of 13 AMPS.
  • Always wear safety goggles and use a special detergent to help remove the grime.
  • Take care when using the washer near plants.

Pressure washing is a quick and easy way to clean decking and patios. Pressure washers are also perfectly suited to cleaning driveways, garden furniture, fencing, guttering and more, making them the ultimate outdoor cleaning tool.

You’ll find a wide range of pressure washers at Homebase along with all the washing detergents and accessories you’ll need to get your decking or patio looking as good as new without the hard work of manual scrubbing. If you’re looking for help and advice before purchasing your pressure washer, take a look at our pressure washer buying guide.

Browse our range of outdoor cleaning tools below or visit your local Homebase store.



Writer and expert