How to remove green algae from garden decking and patios in minutes - without a pressure washer

Algae growth is not just a summertime issue in the UK, and it can be managed differently depending on where it crops up. These organisms typically form as slimy green or brown layers on garden furniture or paving stones, whereas algae on the lawn appear as a dark green or black substance, either slimy or powdery.

Hudson Lambert, who is a gardening and cleaning specialist from Roxil, has given a stern warning to those reaching for the pressure washer when tackling this blight. He said: "Nothing ruins the look and utility of your patio, decking or garden fence like algae, mould and black spot lichen."

"These algae and fungi feed on moisture during winter and spring, taking root in the pores of patio slabs or decking and shed panels. If they haven't been treated beforehand, algae is very difficult to remove."

Lambert advises checking the weather forecast before attempting to remove stubborn algae, recommending a dry, sunny day for the best results.

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In terms of cleaning, he has warned against using pressure washers, which might seem convenient but will fail to rid surfaces completely of black spot lichen. The gardening guru continued by highlighting the potential harm caused by this method: "It can also cause damage – pressure washers blow out pointing and disperse jointing sand in patios. Pressurised water can penetrate decking and fences to cause swelling, warping and rot."

Instead of reaching for harsh chemicals, grab a reliable, stiff wooden brush and make sure it's clean. Sweep away the surface debris from the area you're looking to treat to gently remove algae, mould, and black spot lichen.

A follow-up with a cleaning product is crucial, but the gardening expert cautioned: "When picking an appropriate cleaner, watch out for acid or bleach-based products. These corrosive cleaners can damage wood, patio surfaces, and the skin. Instead, opt for a soft and non-destructive cleaner."

Natural options are always worth considering, such as white distilled vinegar. The team at Decks and Docks have found that white vinegar is incredibly effective against algae on wooden decking.

They advise: "Simply combine one gallon of water with one cup of white vinegar and scrub the deck with the solution to remove algae, mould, and mildew."

When natural remedies don't cut it, Hudson suggests trying Roxil Wood and Patio Cleaner, which is available for £5 per litre on Amazon and has received rave reviews. One satisfied customer shared: "Had green patches on my decking even after jet washing so I got this. I had my doubts as after a couple of hours, it looked no different. The next morning, though, all the green was gone, and some areas were really green before. I didn't bother using a spray as it was far too slow. I just slopped it on with a sponge mop and bucket, and it took no time."

One customer rated the product as "as described," awarding it four out of five stars. Another mentioned it's their "go-to cleaner" for Spring cleaning tasks.

For alternative options, consider trying out the Algon Organic Path and Patio Cleaner at £3.92 per litre or opt for the Spray and Leave Cleaner—Patio Fencing Decking—Green Mould and Algae Killer available for £3.79 per litre on Amazon.