Black spots, algae, and lichen can turn even the most well-kept patio or driveway into an eyesore. They creep in quietly, thrive in damp or shaded areas, and cling to stone and concrete like glue. Even if you keep your outdoor spaces clean, these stubborn growths can still show up—and once they do, they’re not easy to remove with just a brush and bucket.
At Clocklike Pressure Washing, we specialise in restoring patios, driveways, paths, brickwork, and more. Here’s how we tackle black spots, lichen, and algae the right way—and how you can keep them from coming back.
Those unsightly black marks on your stone or concrete are usually caused by a combination of lichen, algae, mildew, or mould. They’re particularly common in shaded areas or places where water tends to sit—such as under trees, beside fences, or along poorly drained paths and patios.
Lichen is one of the most common culprits. It’s a slow-growing organism made of algae and fungi living in a tight symbiosis. Once it takes hold, it creates small but tough black spots that dig deep into the pores of the surface—making them incredibly difficult to shift with everyday cleaning methods.
The most effective way to remove these stubborn growths is through professional jet washing, also known as pressure washing. The high-pressure water loosens and removes the algae, lichen, and other organic matter that regular cleaning can’t reach.
But here’s the important part: not all jet washing is the same.
At Clocklike Pressure Washing, we use industrial-grade equipment that allows us to control both pressure and temperature. For delicate or heavily affected surfaces, we often opt for steam cleaning, which uses high-temperature water vapour to lift off growth without damaging the material underneath. It’s ideal for older brickwork, sandstone, or areas where harsh force might cause harm.
In some cases, we also apply an eco-friendly, biodegradable cleaning solution before jet washing. This helps break down the lichen and algae at the root level, making them much easier to remove. We never use corrosive or harmful chemicals—just safe, effective products that get results without damaging the environment or your garden.
Jet washing does not require chemicals by default. In fact, the majority of our cleans are done using nothing but water—either hot or cold, depending on what’s best for the surface in question.
However, when black spots or algae have been growing for years, even the best jet washer may benefit from a little help. In those cases, we carefully choose cleaning products that are:
Fully biodegradable
Safe for plants, pets, and children
Non-corrosive to surfaces
This approach allows us to deliver a deep clean without creating runoff or residue that could harm your property or garden.
Yes—and prevention is just as important as the clean itself.
Here are a few steps we recommend to help keep your outdoor spaces looking spotless long-term:
If water is pooling on your patio or driveway, lichen and algae will always come back. We can help you spot problem areas and recommend simple fixes to improve drainage.
Shaded areas take longer to dry after rain, creating the perfect conditions for algae and black spots to form. Trim back overhanging trees and hedges where possible to allow sunlight to reach your surfaces.
Scheduling a jet wash once or twice a year keeps dirt, moss, and organic build-up to a minimum. It’s one of the most cost-effective ways to preserve your outdoor spaces and prevent future growth.
After a deep clean, we can apply a protective sealant to stone or concrete surfaces. This acts as a barrier, reducing moisture absorption and slowing down the return of black spots and algae. It also makes future cleans quicker and easier.
Don’t let dirt, moss, and stains take over. At Clocklike Pressure Washing, we specialize in professional driveway cleaning that restores your property’s curb appeal, enhances safety, and protects your investment.
Our team uses top-of-the-line equipment and techniques, including biocide treatments, to deliver long-lasting results. Whether your driveway needs a fresh start or regular maintenance, we’re here to help.
To get a Free Quote, fill out this form or you can reach us directly at 07904666156!
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